Customers are invited to add something “unnecessary” to their costumes to score a $3 burrito and to help raise $1 million for the Chipotle Cultivate Foundation DENVER, 2015-10-6 — /EPR Retail News/ — Chipotle Mexican Grill (NYSE: CMG) announced today the return of its longstanding and popular Halloween fundraiser, Boorito. On Saturday, October 31 between 5pm and closing,…