Hey, I was planning on going, but won't be able to make it. I'm heading out next month though in an attempt for my L2 cert.
The meets are pretty relaxed. Everyone is friendly, and usually will be more than happy to help you. You don't need to join ROC, although you can if you plan on going out somewhat frequently. If you don't join ROC, you will have to pay a daily fee for flying of $20.
Make sure you know your basics, like where the CP is on your rocket. The hardest part of the L1 cert for me was finding where my rocket landed. Someone picked it up and returned it to the registration desk before I could get out there so I spent over an hour looking for it. It looks like you've got an eggfinder though, so that shouldn't be an issue for you.