Last year I worked in a bar at a festival and really enjoyed myself. Are there any websites dedicated to festival jobs and how to apply to them? I know of oxfam and am looking for others.
The forums are often frequented by the various festival organisers, so finding the appropriate people and agencies to approach shouldn't be too difficult. As you'll have found out, festival people are nice people.
I'm hoping to be working at Big Session and Summer Sundae Weekender this year, so if you're going, I'll see you there.