Wappu is other name for 1st of May in
Finland. Origins of Wappu are in labour unions party for labourers and after many years it has turned more and more for students' party when all towns in
Finland (mostly
Helsinki) are occupied with partying people.
Tradition in
Helsinki is to gather at 1st of May to hill of
Ullanlinna in southern tip of
Helsinki cape where tens of thoudands of people are having fun and sparkling
wine :)