First time RV Camping

Wife and I are reaching on Thursday and will be able to checkin on time however our friends are coming it late. Four on Friday and one on Saturday. How do they get access to the campsite? Based on what I understand they must provide my order number at checkin to get the wristband as long as the RVs capacity has not yet been reached.

Question:

Can I pick 6 wristbands in advance when I first checkin?

Our RV is meant to sleep 6 will they allow us to get 7 wristbands?

Edit: Can we get to the camp checkin from inside the festival?