No, you ought not attend. Both of them are bound to have their marriage witnessed by a priest or deacon in the sacred setting of the Church. In celebrating the marriage outside the church without permission, they are entering into an invalid marriage. To attend, and to celebrate with them, signals support of this sinful action. 
 
While these sorts of situations are awkward, you are not the source of the awkwardness, they are. A firm line is appropriate in such serious matters which underscores the sinfulness of the situation. 
 
Your explanation to them of your incapacity to attend should be done charitably, leaving the door open for further discussions leading to convalidation in the near future, should they still go forward with their plans. 
 
Finally, avoid harsh debates with other family members who may still go. While attendance at such weddings is strongly discouraged, Church Law does not absolutely forbid it given the human complexities involved in such situations. Some respect for prudential judgments that differ is appropriate. 

No, they are not equivalent. There are degrees to mortal sin just like there are degrees to venial sin. First‐degree murder is more grave than missing Mass, or viewing pornography, or any other grave sin that we might imagine. 
 
It is true that killing someone and missing Mass are in the same category of "mortal," (or grave) sin. But they are no more equivalent, than a rat is equivalent to or the same as a man, simply because they are in the same category "mammal." 
 
Your description of both sins as being punishable by eternity in Hell also implies an equivalence by that fact. However, a distinction is necessary regarding the way you connect the notion of eternity to punishment. That one is in Hell eternally, is not due to punishment per se. Rather, the eternity of Hell (or heaven for that matter) exists because, at some point, our decision for or against God, and the laws and values of his Kingdom becomes a decision that is for us at death forever fixed. Thus, that Hell is eternal, is not by itself a gauge of the punishment involved. 
 
We need not presume that everyone experiences Hell in exactly the same way, any more than we presume that everyone experiences heaven in exactly the same way. There may in fact be degrees of suffering in Hell, and degrees of glory in Heaven. 
 
While there are mysteries involved here, it makes sense that there are some Saints who, on account of extraordinary virtue, have a greater capacity to appreciate God's glory in heaven. It also makes sense that for those in Hell who have rejected God, and his Kingdom, there would be degrees of suffering experienced, related to how deep their rejection of the light is. Scripture indicates we are judged according to what we have done (Revelation 20:11‐15). Thus, there is at least implied some relationship of reward or punishment rooted in what we have done or not done. Jesus also speaks of places of special honor in heaven, indicating levels of some sort in the afterlife (cf Matt 20:23).

Irritation of this sort is perhaps understandable, when a phrase gets picked up and used widely in multivariate ways, and thereby comes to be seen more as a slogan than as informative. 
 
That said, the New Evangelization is officially used to mean several rather specific things. First it is new, in the sense that we, as a Church, cannot afford to do business as usual. We must behave in new ways. We can no longer be content to sit within our four walls and talk about the faith among ourselves; we must go out. We cannot simply think that evangelization is opening the doors and hoping people come. If there ever was a kind of inertia that brought people to church, that is not so now. It is clear that we must go into the community, into the culture, and re-propose the gospel. In this sense, “everything old is new again.” For the new evangelization seeks to go back to Christ’s initial Instruction, "Go unto all the nations and make disciples…” (Matthew 28:19). 
 
New evangelization also appreciates that we cannot simply say what we believe, we must explain why, and show its reasonableness. Perhaps in previous times, it was sufficient to argue from authority, but these days, people want to know why, not just what. 
 
Thirdly, evangelization is “new” in that we must vigorously engage in all the new ways of communicating that have exploded on the scene today. We must creatively engage all these new forms of communication, along with the traditional modes of communication, such as writing, cinema, radio and so forth.

To clarify, Pope Francis was seated in the back of the chapel prior to the sacred liturgy. Once the liturgy began he vested and moved forward to the celebrant’s chair. 
 
The celebrant of the mass sits up front in virtue of the fact that he acts in persona Christi. Hence, the celebrant’s chair, and he, being seated in a prominent, visible place in the sanctuary, is not honoring of “Fr. Joe Smith” the man, but, rather, of Jesus Christ who acts in and through the priest, who is configured to Jesus by holy orders. 
 
In this sense, through the Sacrament of Holy Orders, the priest in the liturgy is a kind of sacrament of the presence of Christ. It is Christ who is honored, and has a prominent seat. Jesus Christ is the true celebrant and high priest of every liturgy.

There are several problems with this challenge. 
 
First, the Catholic Church celebrates Jesus’ birth on December 25, but this is a matter of custom rather than doctrine. It is not Church teaching that this is when Jesus was born (note that the matter isn’t even mentioned in the Catechism of the Catholic Church). 
 
Second, although most Christians today celebrate Christ’s birth on December 25, this was not the only date proposed. Around A.D. 194, Clement of Alexandria stated Christ was born November 18. Other early proposals included January 10, April 19 or 20, and May 20 (Jack Finegan, Handbook of Biblical Chronology, 2nd ed., §488, §553). By far the most common proposals, however, were January 6 (ibid., §§554–61) and December 25 (ibid., §§562–68). 
 
While the last was eventually adopted by the Catholic Church for use in its liturgy, the fact that the Church did not declare alternate proposals heretical shows the matter was not considered essential to the Faith. 
 
Third, the proposals that put Jesus’ birth in the colder part of the year (November 18, December 25, January 6, and January 10) are not ruled out by the fact that there were shepherds keeping watch over their flocks at night. 
 
Ancient Jews did not have large indoor spaces for housing sheep. Flocks were kept outdoors during winter in Judaea, as they are elsewhere in the world today, including in places where snow is common (search for “winter sheep care” on the Internet). Sheep are adapted to life outdoors. That’s why they have wool, which keeps body heat in and moisture out. 
 
Sheep are kept outdoors in winter in Israel today: “William Hendricksen quotes a letter dated Jan. 16, 1967, received from the New Testament scholar Harry Mulder, then teaching in Beirut, in which the latter tells of being in Shepherd Field at Bethlehem on the just passed Christmas Eve, and says: ‘Right near us a few flocks of sheep were nestled. Even the lambs were not lacking. . . . It is therefore definitely not impossible that the Lord Jesus was born in December’” (ibid., §569).

One of the difficulties in understanding why Jesus suffered for sinners is that many of us, especially in the modern world, tend to think of sin only in legal terms as the breaking of some abstract rules. But sin causes real harm, and has real effects, and these must be healed. Something actually has to happen. 
 
For example, let us say that you see me near the edge of a cliff and I warn you to take three steps to the right. But let us also say that, out of rebellion, I take three steps to the left, and slide down a great cliffside into an abyss. I lie there, injured and utterly incapable of ever rescuing myself. Let us then say, in my humiliation and pain, I cry out and ask you to forgive me. In your mercy, you say yes. And that is forgiveness. But in order to be healed and restored, you will now have to expend great effort to come down the cliffside, care for my wounds, and carry me out of the abyss. 
 
As I hope you can see by this analogy, my sin was not simply the breaking of rule. Deep and devastating effects happened in my life, and I was incapable of restoring myself. And this was our state; we were dead in our sins (Col. 2:13). We were incapable of ever restoring or healing ourselves. 
 
Jesus therefore, not only brought us God's forgiveness, but also extended the effort and agony to come down, heal our wounds and lift us up. This was a great, and painful, effort. Our sinful disobedience had brought us suffering and death. Jesus took up that suffering and that death in order to restore us, even elevate us to a higher place. 
 
The horrible suffering of Jesus shows us very clearly how awful sin really is, how it disfigures, wounds, and even brings us death. These are realities, and Jesus takes them up in order to heal them and carry them away for us. We tend to make light of sin today. It is no light matter, and to remember that, we do well to look to any crucifix and see what love cost him.

As a general rule, no. To do this is to engage in scandal wherein one gives temptation to others, and contributes the lowering of moral standards. It is wrong to celebrate or encourage immoral activities. There is, however, the fact that movies and drama do comment on life and the human condition, which includes violence, treachery, corruption and sexual sins and so forth. To treat of these matters in drama, (as even the Bible does), is not per se wrong. What is wrong is to celebrate such sinfulness, or seek to justify and normalize it. 
 
Even more erroneous is to unnecessarily display what should not be seen. For example, to include a murder in a movie does not require us to watch a person brutally killed and dismembered. Likewise, to report a sexual infidelity does require us to watch it pornographically portrayed. Subtlety and discretion are required to treat topics like these. 
 
So Catholic actors should not transgress when sin is either celebrated or inappropriately displayed.

As a general rule, there is a precept that we refrain from engaging in work or activities that hinder the worship owed to God, The joy proper to the Lord's day, the performance of the works of mercy, and the appropriate relaxation of mind and body. (Catechism #2185). 
 
That said, we also do well to avoid an excessive legalism against which Jesus himself taught when he said The Sabbath was made for man, not man for the Sabbath. (Mk 2:27) 
 
Hence, while one might ordinarily seek to avoid folding laundry etc. on a Sunday, such activity is not intrinsically wrong. Perhaps one finds such an activity relaxing in the company of other family members. Perhaps too, since the activity could not reasonably be accomplished on Saturday, it is an act of charity that helps the family to be prepared for the week ahead. 
 
Thus, we do well to seek a proper balance between maintaining the principles of joyful rest on Sunday, and avoiding excessive legalism.

Of its nature, the viewing of pornography is a mortal sin. As with any mortal sin, one’s culpability (blame worthiness) is affected by how freely one consents to the act, and the degree to which one fully knows and understands the gravity of the evil involved. 
 
Internet pornography presents a very serious temptation to many, and many pastoral challenges for the Church. The fact is, today, increasing numbers of people compulsively view this sinful material, and many are outright addicted to Internet pornography. 
 
As any confessor or pastor of souls will be able to attest, large numbers are approaching the confessional and counseling and are quite “stuck” in Internet pornography. Many have seen their relationships and marriages greatly harmed, and some even end up with criminal charges related to the viewing of pornographic images of minors. Addiction to pornography is a slippery slope that leads to increasingly debased and degrading imagery. Pornography is indeed, a snare, which lures its victims with promises of momentary delights, only to leave them quickly hungry for more. This is due to the increasingly insatiable lust that it ignites. 
 
One of the more effective remedies that has emerged recently is a system of accountability, wherein one's Internet activities are monitored and recorded, and a daily report is sent to someone of the pornography addict’s choice. This “sponsor,” of sorts, reviews the list and holds the addict accountable. Certainly too, filters can be of some help, to prevent tempting materials from appearing in the first place. These filters can be of great help to those who struggle more mildly with the problem. Sadly though, many true pornography addicts know their way around such filters. 
 
Finally, this salutary reminder: absolutely nothing we do on the Internet is private. When we are on the Internet, we are out in public, and our browsing habits are not hard to discover, for those who might wish to know. What’s done in the dark can be brought to the light. 
 
Take Internet pornography seriously, it is a grave sin, which causes great harm, and is highly addictive to many people. The Scriptures say, Flee fornication (1Cor 6:18). And one does well to heed this prescription in a particular way related to Internet pornography. Flee pornography; it is a snare.

No, both words are the same. Hallelujah is a Hebrew word, ( הַלְּלוּיָהּ Hallal (Praise) + Yah (The LORD). Hence “Hallelujah” means, “Praise the Lord!” But the exact way that the Hebrew letters are transliterated into English and other languages has varied a bit over time. Perhaps most influential is the fact that the Greek New Testament rendered the Hebrew word Hallelujah as ἀλληλούϊα (allelouia). And since Greek is generally more influential in English spellings than Hebrew, many English translations render the word as Alleluia. 
 
However, not an insubstantial number of English translators have preferred over the centuries, especially when translating the Old Testament Hebrew, to render the term Hallelujah. Some translators will use Hallelujah for the Old Testament and Alleluia for the New Testament. 
 
Music has also influenced the decision over which spelling to use since some of the famous compositions from the Baroque period, such as Messiah, used the spelling Hallelujah that was more common in earlier English translations of the Bible. 
 
At the end of the day, it is the same word, just with different spellings.