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 Google+ 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.