Śmigus-Dyngus — Poland

Śmigus-Dyngus turns Easter Monday into Poland's wettest national celebration, where participants drench each other with buckets and water guns in a tradition dating back to the 14th century. Over 70% of Poles under 30 actively join the water fights, with the city of Łódź consuming 50,000 liters of water during the day. This ritual is 3 times more participatory than the average Easter tradition on this list, and it outranks #4's Burning of Judas in physical engagement because it involves virtually everyone on the streets.