I don't go to reunions that are free, so I'm probably not a good one to give advice. Therefore, here's my advice.
If you're going to see old friends you care about, then go and have a great time. If you're going to show everyone they were wrong about you and you did make something of yourself, don't bother. They're not worth it. If you're going to show them how a real Conquistador dances, make sure someone is capturing video.