Much beloved Mission java spot Four Barrel is celebrating the big 0-3 this Tuesday with a b-day bash chock-full of free stuff. From 7 a.m. to 4 p.m. the woodsy, cult-worshiped shop will be serving up gratis coffee, and at 12 noon birthday cake (perhaps espresso flavored?!) from Tartine Bakery will also be up for grabs. Balloons, skee ball, an old-school photobooth, and other festive elements will also be thrown in. Plus, we're guessing, more haute hipsters than you can shake a stick at. A note to all your stragglers: The spot will also be closing early, at 4 p.m. sharp.