Back Yard Burgers FREE Food Offer: FREE 1/3 lb. Classic Burgers Today (First 100)May 28, 2013 By Kelli This post may contain affiliate links or sponsored content, read our Disclosure Policy. Facebook Twitter Pinterest LinkedInBack Yard Burgers FREE Food Offer: FREE 1/3 lb. Classic Burgers Today (First 100)To celebrate National Burger Day on May 28, be one of the first 100 guests at a participating Back Yard Burgers location and you’ll snag a FREE 1/3lb Classic Back Yard Burger. Sounds awesome to me!To find a Back Yard Burgers location near you, so you can take advantage of this FREE food offer, go here.