Can I just visit this during the daytime before their nighttime event starts? Planning on going today, but there's a Norah Jones concert at 930pm. Was thinking maybe checking it out at 3pm? If so, where can I park?

You can actually go there and check it out before the concert 3 could be an issue though I don't know what time they shut it down for the concert so they have the room for parking

Update: I went at 2pm and was able to check out the amphitheatre until 230pm when they closed the gates.

There are a bunch of lots for the venue open during the day

Yes, you can go earlier. Im not sure where to park. There's lots of parking. Its a little hike uphill to the amphitheatre.