Today it’s Walpurgis night and in Sweden we light fires this evening.
An old tradition in my town Trosa was to burn the last boat on land by putting it on top of the walpurgis fire. Trosa is an old fishermens place and the boats should be in sea before Walpurgis night. Otherwise they risked to be burned. The tradition probably came from the fact that boats still on land after Walpurgis didn’t get to sea at all because such boats didn’t work as boats anymore, is my guess. Old boats or broken boats maybe.
Here’s a drawing I did last year about Walpurgis night.