Lots of water and sunscreen... (it is July)
I think it was 104 on the day my wife and I came out last year... wife was not happy about that car drive
You can't see it all in 1 day... even 3 days is tough.
Rock crawl, engine dyno, dealer displays, swap meet, car coral, and that's not even the rows of cars, specialty tents & barns.
And all this is on top of if you are NOT going to ... have diner with the group one night, go to the drive in out there, watch the drag races or hit a local cruise!
I have never gone and not enjoyed meeting & seeing the people of this forum and flat out had a good time.