Does your HS have an Alumni Association? If so, that'd be a great place to start because hopefully they'll have the most recent addresses of your classmates. My alma mater's big on reunions every five years, and this year my class had a mini five year reunion at Dave and Buster's.

My suggestion is to start planning early...maybe even a year in advance. Once you get the addresses of your classmates, send out a letter to see how many of your classmates are actually interested in attending the reunion. With that to work with, you can determine how many events you should have, where the events should take place, etc.

Having a reunion website totally helps too! I know a lot of classes like to list "WHO'S GOING TO THE REUNION" as a way of letting everyone know who's actually attending.

Hope this helps! Getting everyone together for our mini five year reunion took some work, but I had fun helping with the planning. I have a feeling I'll be called on once again in 5 years for the big TEN YEAR!