Top Definition
A 24-hour reign of debauchery and drunkeness in Davis, CA focused around the alcohol-soaked college students of UC DAIVS. Many who indulge in this springtime event have little to no recollection of the day spent. This is event is heald just before the Whole Earth Festival, and is home to over 200 events
Girl: Woah! I have the worst hangover ever. And where are my clothes?!
Friend: Ah, Picnic Day strikes again!
by aggie of the past June 01, 2011

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