Væglesrønglegäst 

Væglesrønglegäst is the traditional Scandinavian holiday, usually celebrated on the last day the chicken caws in may, which marks the anniversary of when the previously longest reigning Swedish king, King Magnus IV's fermented left testicle was retaken back from Danish land, marking the official end of the War of the 12 Kings.

Karl: "Oh! I would really love some sooooop today, I've been hungry all Væglesrønglegäst week!"
Sven: "I wish Væglesrønglegäst came twice a year! We should celebrate more than just one day for Magnus!"

Væglesrønglegäst by A Traveller May 28, 2019