I'd have to say Greek Sing. Each year the fraternities and sororities on campus would have a week long set of competition events called Greek Week. We usually had bands play in The Quad like Violent Femmes ("Blister in the Sun") and others. At the end of each week we had singing competition called Greek Sing. The best one I remember is getting up on stage where we did a couple different types of songs in which we had to integrate the sorority names into the song along with lyrics that complemented the theme for Greek Week. I remember being on stage with two other guys doing scat poetry, and then everyone getting involved in a James Brown remake of "I Feel Good!"
Ahhh, those were the days.