Spring Fling is an annual festival for the students at the end of each Spring semester, usually beginning on the Friday of the second to last week of the semester and continuing until Saturday night. Fling, which began in 1973, is dubbed the largest college party on the East Coast, and is hosted by the university's Social Planning and Events Committee.[8] The event takes place on College Green, Wynn Commons, and The Quadrangle (or Quad) for a student body drenched in alcohol, for the most part. Over the past few years there has been legitimate discussion towards potentially moving the event out of the Quad, but improved behavior has resulted in the carnival aspect of the festival remaining in the Quad. College Green becomes a staging area for carnival games and carnival food. Two stages in the Quad host Penn's performing arts groups. Saturday night, Penn holds a festival on College Green, and Friday night SPEC (The Social Planning and Events Committee [7]) brings in a headlining musical act for a concert. Past guests for this concert have included Wyclef Jean, Busta Rhymes, Sonic Youth, and Of A Revolution.[9] The 2007 concert featured Ben Folds and Third Eye Blind. The 2008 concert was moved to Franklin Field since it featured a triple-bill of Ludacris, Gym Class Heroes, and OK Go.[10] Learning from the 2008 concert, 2009's concert featuring Guster and Akon ran much more smoothly.[11] The 2010 line up was Kid Cudi, Shwayze and Snoop Dogg. The 2011 Fling performers were Ratatat, Flo-Rida, and Lupe Fiasco. The 2012 Fling performers are Tiesto and Passion Pit. （From Wikipedia)
I went to this year's concert and It is quite exciting and crazy, DJ Tiesto is said to be the top 3 DJ in US.