What are the reasons you would like to go, and the reasons you don't want to? Once you have figured out your reasons both ways, you could look at them and see which reasons sound better to you.

For example, well, nobody that I went to high school even knows where I am, so I have never gotten an invitation to a reunion. Part of me wonders if anyone would remember me at all, and would like to find out, because I think I don't exist in that world anymore. Part of me would like to use it as a stick to beat myself if I found out that they don't in fact remember me at all, and that I don't matter in that world. Part of me says it just wouldn't be worth it to travel that far. Part of my hurts because I want to be remembered, and to have a connection with my past. It's a tough question. I don't know about you, but I have a tendency to deny myself going to events that I know I'll regret missing, just to hurt myself. Like I didn't go to my own university graduation (and they gave me like three different chances to be part of one), and I said it didn't matter and wasn't worth the travel and taking time off work, and I wouldn't know anyone there anyway. Do you do that?

Maybe look at what would be the most positive choice for you? Meeting with just the people you want to see sounds like a good option, if you would like to see them but don't actually want to be at the reunion. How far away is it?