There's a lot of good advice for you here. I would add maybe bring something homey with you to leave at where you're staying.

Check out the booths between acts. Talk to the sellers. You don't have to buy anything, but it will help keep the nervousness down.

And dress for the weather.

Good luck and hope you enjoy the festival. My husband and I are going to Retro Futura next month. Going to be interesting because the last performer I saw was Kenny Loggins, and that was before the breakdown.