You people are so jaded.
If you find someone special enough that you want to stay with that person for the rest of your life, I think your friends, if they are really your friends, would be thrilled, and they will throw you as many parties as possible with such person.
Of course if you do things because of social norms, it sucks, but that is our great advantage as gay people, there have never been actual "gay" marriages in societies, it was a rare thing, and always treated completely different than the way we are treating it now. So we get to make our own customs and create our own families, I'm really looking forward to the idea of creating my own kind of bachelor party, and my own kind of shower and specially my own kind of wedding, I don't have to settle for a social norm, and the best thing is that no one would be expecting such a thing.