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1.
The Breastival is the never-ending show of awesome titties and juggies and breasties all over the world.
More and younger girls join the Breastival every day, and it is a GOOD thing.
by Jacques Asse June 11, 2009
 
2.
Any recreational or public event or location which possesses a high likelihood of featuring multiple young women prominently displaying their chests.

Often used as an outdoor version of breastivities.
Guy 1: Dude, you going to the class picnic this summer?
Guy 2: Dunno...is it worth it?
Guy 1: Are you kidding? Last year the thing was a total breastival!

College Guy: Hey, it's sunny - let's get out of the dorms and walk around the quad, it's sure to be one heck of a breastival out there today.
by Peter Lorre January 12, 2010