I'm probably wrong, but something about the wording makes it sound like you buy a ticket and get to go to both shows. Seems like, in the past, if a band is playing two shows, it just lists the band under each separate date. But this one says,
TUES FEB 10, WED FEB 11 - two nights with: THE SHINS $12adv/$15day mainstage 8:30
I dunno, maybe I'm projecting.