Met my husband-to-be, a Sidmouthian in 1972, so gradually got into Sidmouth Festival after that. They only knew about "the dancing" and we'd walk up the Knowle Drive and peep between the trees and bushes for a free view, while my very much younger sisters-in-law-to be went to the Hobby Horse Club in the Blackmore Gardens. I rooted out the other music myself, and we went to concerts in the Beach Store and the Drill Hall.
My first whole weekend camping Festival would have been Killin Festival by Loch Tay in one of the most beautiful parts of Scotland in about 1999: I went every year until sadly it ceased to be a few years later.