By MIKE SOSNICK
Nearly every student knew that Carly Rae Jepsen would be playing at Barton Hall on Sunday, but there weren’t many that seemed to be going. There wasn’t a steady stream of them trudging up from Collegetown, and people that I talked to treated the fact that I was going more as a gag than a given. The queue for laughably ineffective pat-downs at the entrance was nonexistent and the slim number of people already in Barton at 7:30 didn’t grow much ahead of the headliner’s set. The few stragglers didn’t miss much, though. The night’s opener was the wholly replaceable St.