The Annual Crayfish Party - Kraftskiva! A crayfish party is a traditional summertime eating and drinking celebration in Scandinavia. The tradition originated in Sweden in the 1500's, where a crayfish party is called a kräftskiva. Crayfish are to be eaten outdoors, and gaily colored paper lanterns should be hung round the table. The most popular type of lantern shows a smiling full moon. Both the tablecloth and the colorful plates are also supposed to be of paper. People wear bibs round their necks and comic paper hats on their heads. For more crayfish traditions, see website sweden.se!