No trick: Costumed customers score entrees for three bucks, plus a chance to win free burritos for a year DENVER, 2017-Oct-18 — /EPR Retail News/ — Chipotle Mexican Grill (NYSE: CMG) will be holding their annual Halloween Boorito celebration on Tuesday, Oct. 31, from 3 p.m. to closing, at all Chipotle locations. Customers who show up in costume will be treated to…