I would DEFINITELY recommend buying a parking upgrade, and do it ahead of the show. EZ parking is in entrance 1, and the Gold, Premier and other upgrades are entrance 2. We were told incorrect information multiple times, so we spent 30+ minutes just finding where we needed to go.
There were no directions on where to find that parking ahead of the show, so we asked a parking attendant.
We decided to purchase the EZ out parking for $80. I did my best to research before attending the Simple Plan/Sun 41/Offspring concert, so we were prepared for the traffic and wait times.