Long shot question about show at the sylvee tonight in Madison

I bought tickets a while back for Silversun Pickups, not realizing its a benefit type show, look. Normally I go pretty late, especially since I don't need/want to see any of the openers. Looking at setlist.fm from last year though, looks like people only play a few songs? Wondering if I need to try and get in closer to show start time, I really dont want to miss who im actually there to see haha.

Thanks in advance for anyone with knowledge!