“Take my fascination with Grateful Dead songs and mix it together with my love of psychedelic improvisational bluegrass music and out burps this project,” says Keller Williams. So he’s hit the road with Jeff Austin, Danton Boller, Andy Hall and Jeremy Garrett. And this project—Keller Williams’ Grateful Grass, loose bluegrass takes on Dead tunes—comes to the Capitol Theatre tomorrow night. To make things even better, we’re giving away two tickets. To enter, fill out the form below, making sure to include your full name, e-mail address, which show you’re trying to win tickets to (Keller Williams’ Grateful Grass, 4/20) and a brief message explaining why you’ve got to be there. The winner will be notified by tomorrow.