I just went for a concert there last week and parked in the general parking which was free and about a 5 minute walk to the amphitheater. Whether you Uber or drive your going to be stuck in traffic for a while so plan on going early. Have fun, I wanted to go for Santana but can't make it!
Parking is free at the venue but let me warn you ahead of time. We missed the first half of the concert as did about half of the concert goers because of traffic and trying to just get to the amphitheatre. We lucked out and the band at the end started over just for those that missed the first half. If I were to do it again I would take a taxi and get dropped off at the main gates.
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