I purchased it also, and I see no information on how to get in at 5:15 for warm up session. The ticket says 7:00 pm.
Phurpa L. asked on Dec 3, 2012
For Pre-Game Warm-Ups, please present your ticket at the Groupon entrance [located on 6th St. next to the Greene Turtle Sports Grill] starting at 5:15PM.
Marty S. from Groupon replied on Dec 4, 2012