An annual event at the University of California, San Diego in which the normally reserved student body engages in an all-day exercise in debauchery. It is usually held in the middle of UCSD's spring term, which drops it somewhere in early May.
Highlights include: students drinking in lecture, carnival-style games and booths selling food, innumerable dorm parties, and a concert at the end of the day with national acts.
Notably, it is the only event at UCSD that draws a significant number of students from San Diego State University, the area's renowned party school.