The deal is good from 3 PM to closing on Monday, October 31, 2016 (and is also valid at restaurants in Canada and Europe). If you're not a fan of burritos, you can also choose a bowl, salad, or order of tacos for the same price. There's not restriction on costumes so you could technically tuck your head into your t-shirt, say you're dressed up as a headless person, and get your discount.
The $3 price marks an over 50% discount as most entrees at Chipotle at $7 or more (varying with location).
Proceeds from the this year's event, up to $1 million, will benefit the Chipotle Cultivate Foundation, which is committed to "creating a more sustainable food future."
Photo via Chipotle.