Bill went and stuck with the other Losers. He may have been a little nervous about this because he hasn't really filled Mike in on this part of himself but he wore this shirt and he messed around with nail polish. He probably stuck close to Stan and held his hand. Maybe there was kissing.
Ray was there with John Constantine. They held hands and there may have been a kiss but Ray didn't try to initiate too much pda unless John was okay with it. They drank and, by now, Ray has sort of accepted that John isn't going to give up smoking. He still frowns about it a little but he doesn't complain.
Luke went on his own. He's not dressed any differently than he was but he does have a rainbow pin on. He'd talk to and hang out with anyone. He's kind of excited about this and all the positive energy has him in a great mood.
Prompto was there with his chocobros. He took pictures because when is he not taking pictures? He also held hands with two of them at a time. Kissed Ignis and then pulled Noctis aside because, damnit, he's tired of dancing around this and if he has to make the first move he will! So, yeah, Noctis got kissed. Gladio, too, probably.
Adam went to show his support. He's not sure what his own sexuality is anymore and Michael is both asexual and has no actual gender so it's a weird thing? Whatever. He's there to support people and show this great big positive thing off to his angel.
Tommy is there as a show of support for any and everyone. He needs more friends and to be around people.
I think the only one who wouldn't attend is Ciri unless Jaskier and Geralt went... and I think that's everyone?