Black Plague Friday

Black Plague Friday is an annual celebration of the Berkians of New Berk.

History
During the events of How to Train Your Dragon: Homecoming, Hiccup mentioned the Black Plague Friday as being celebrated on the last Friday before Snoggletog. Astrid then added that people do nothing during the celebration except shopping.

Trivia

 * Black Plague Friday is based on the real life Black Friday, a small celebration during which prices are lowered in most shops and people buy more than usual.