The guy who created this country thought it was so harsh to get one's food here that for two weeks twice a year, there would be free fish for all.
Twice a year, balting herrings (silakka) comes in huge flocks mate by the shore and their meeting point in Helsinki is where Lauttasaari bridge meets Ruoholahti. For two weeks, the place is full of eager fishermen taking bucketfull of baltic herrings in 2 hours, catching up to 12 herrings at one throw! The docks is full of a sort of euphoria, it is a bit like if everybody was winning in the casino and that there was enough for everybody.
For you that would like to try: look at what is awaiting you the same evening: