How often is glastonbury?

Answer 1

Glastonbury festival is once a year, though it occasionally takes a year off, next year it isn't on as all the porta-loos are going to the Olympics apparently.

Glastonbury the town where aforementioned festival takes place is pretty consistently there year-round.

Answer 2

The Glastonbury Festival of Contemporary Performing Arts was not held in 2012. However, it will be held this year, 2013. The dates are June 26 through the 30.

Answer 3

1970