Gosh I can't believe I actually went. Ten years ago I said I wouldn't go unless I was married and/or successful. Yeah. Not so much. I'm so glad I went though! It was weird at the beginning, and cliquey, but by then end I think everyone was comfortable enough to talk to anyone. It was just...nice. I saw a bunch of people I hadn't seen for 10 year (obviously) and it was just nice to catch up (even though Facebook has been facilitating that superficially for a year or so now). I love friends who you can just get right back into talking too, and even I hadn't seen those people for years, it was like time hadn't passed. So, yeah, it was nice. I might even attempt to keep in touch with a few people.
I guess maybe you can kinda sorta relive old memories, or at least create hope for new ones.