I just got an email...
Get $50 off catering or Burritos by the Box for 20 or more. Don't siesta this fiesta.
Order now at 1-800-CHIPOTLE
Chipotle store locator HERE [chipotle.com]
Offer valid only on Burritos by the Box or catering orders (not including chip spread orders) picked up from Chipotle from May 1, 2016 through June 30, 2016. May not be combined with coupons, promotions or other offers. Subject to availability and void where prohibited. Additional restrictions may apply.
Additional savings using Discover card this quarter as restaurant purchases are 5% cashback if you signed up for it. Maybe buy some Chipotle gift cards and use them to pay for the catering order too, as for each $25 gift card you buy in store, you get a coupon for a free burrito (for details see link below).