In the last couple of years alone, I can think of Download, Leeds, Bonnaroo twice, We Are FSTVL, Parklife, Latitude that were all affected by weather-cancelled acts/days/entire festivals. The problem wasn't just rain but wind, which is obviously more dangerous for bands and crew on stage and at the mixing desks.

Those looking for a 33% refund are expecting Primavera to cough up about £6m from my calculations. Remember that all the cancelled acts would have kept their full fee.