Free Double Steakburger at Steak ’n Shake – Offer Finished
Celebrate National Hamburger Day by wearing any American flag item to Steak ’n Shake on May 28, 2026 to get a free Double Steakburger. Valid in-store only, limit 1 per person - a pretty easy win if you own a flag hat, shirt, pin, or anything remotely patriotic enough to count.
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