What you need to remember is that it's not a festival. It's just a relaxing weekend's camping enjoying the company of like-minded people - whether you know them or not. Many people who enjoy old time American music in this country find it difficult to meet up with others, and this is a good chance in a great spot. If you go in clutching your favorite instrument and you see a jam - go and check it out. It's your chance to learn some good old tunes and songs, and maybe a bit of Appalachian dancing. Old time sessions make learning tunes relatively easy, because the tunes are played many times over - the more you play them the better they get.
Cheers
Ray