La Tomatina Buñol, Spain The last Wednesday in August.
Full Moon Party Ko Pha Ngan, Thailand During the full moon, every month
Burning Man Blackrock Desert, Nevada Starts 8 days before Labor Day, September
Glastonbury Music Festival Pilton, England The last weekend in June
Holi India The full moon in March.
Bay to Breakers San Francisco, California The third Sunday in May.
The Netherlands (Amsterdam has the biggest party)
Second week in July
For more info on these parties, click here.