Songkran Water Festival (Chiang Mai, Thailand)

Chiang Mai transforms into Earth's largest water fight during Songkran, with over 200,000 participants flooding the moat-ringed old city over three days. This celebration, marking the Thai New Year, involves relentless soaking with water guns and buckets, ensuring no one stays dry. It claims the title of wettest street festival globally, a benchmark no other entry—not even San Fermín's bull runs—matches. The festival's cultural significance is profound, blending purification rituals with communal joy, and it outshines Festa di San Gennaro in sheer scale of participation, attracting twice the crowd.