Holy crap, you guys. Just when you thought Boston Calling was the biggest music event of the year, Coverse and Bowery Boston dropped this on us: A killer five-night lineup of shows, kicking off April 27, that includes—wait for it—Cambrdge-bred Passion Pit, Slayer, The Replacements, Chance the Rapper, Dinosaur Jr. and more. And it’s all totally free.

We’ll wait while you pick your jaw up off the floor.

Good? Tickets will be doled out through a lottery (we’re guessing competition is going to be a little fierce) through an online registration process starting this Monday at noon. Registrants cant sign up for a chance to win two tickets for the show of their choice. The hardest part, as we see it, is going to be choosing which night to play for.

Peep the full lineup and register here. And godspeed.