I just launched a website dedicated to organizing tailgates and watch parties for sports fans. One of the features of the site introduces you to fans that live in your area and follow the same teams as you. It shows where your fans meet for watch parties and ultimately grows your fanbase in your area. This is perfect for alumni groups.
There is also a free app for Android on the Google Play Store called Fan Map that directs your friends to your tailgate. We have an iPhone app dropping soon as well.
Please feel free to check it out, and thanks in advance for any feedback. I live for college sports, and hopefully our site/app can help sports fans get more organized on gameday.