I think most schools have taken up a policy similar to Zeta's. UCF has gone dry so we don't have to worry about being the only sorority that cannot have these socials that involve alcohol being served to underage drinkers. We use have socials at the fraternities houses all the time. I honestly think that those were probably my favorite socials. At the end of my freshman year, UCF adapted the policy. Now, all of our socials that involve alcohol must be taken off-campus. It's much more expensive this way because you have to rent buses and all the other stuff. But, it keeps the university and the sororities/fraternities out of trouble. Plus, my 21st is in February anyways.
