Bumbershoot raining-on-festival gag

Bumbershoot is Seattle's long-running music and arts festival, first held in 1971, and is typically staged at Seattle Center over Labor Day weekend. The festival has a well-documented history of performances in variable Pacific Northwest weather, including rain, and that pattern has helped spawn a local joke that 'it always rains at Bumbershoot.' The gag is commonly invoked by residents when discussing outdoor Seattle events.