Unfortunately all good things must come to an end. After the class reunion is over we've all got lives to go back to. But saying goodbye doesn't mean you have to wait another 5 or 10 years to talk with your classmates. In today's high tech world it has become so easy to stay in touch through email, class web sites or alumni sites.
Before you leave your reunion, make sure you exchange contact information with those you want to keep in touch with. Find out if your class has a web site or other online meeting place to exchange contact information through. If so, make sure you add yours so clasmates who are looking for you know how to reach you. Make sure you keep your contact information current through such facilities or with your reunion commitee so they know how to get in touch with you for the next reunion.
If your class did not set up a web site prior to the reunion, it's not too late to do so now. Done right a web site can be a powerful tool for keeping your classmates connected between reunions.