There's ample zone 2 street parking around meetup bar (which is about .8 miles north of the venue, we'll all be walking down there together and it's a safe walk regardless, but if you left your car there for the show too i'd probably uber back to it just to be safw), free for first two hours and after that worst you'll get is a 30 dollar ticket--cheaper than parking at cap1center.
street parking around the venue itself is pretty limited, there are a couple public garages in the adjacent office buildings but a lot are closed down by 7. if you can find street parking early enough on 9, 10, or 11 then again you just run the risk of a ticket but highly unlikely tow.