Any groups doing older ultimate raids and stuff?

So I haven't played the game in like a year and a half and I kinda want to get back into it. I've always wanted to do like the more difficult older raids and stuff (like pandeamonium for example) but never really got around to it until now I guess. So what I'm asking is are there any groups that do this stuff? Is that like a thing or am I cooked on this one?