The folks who declare food holidays have designated May as National Hamburger Month and May 28 as both National Hamburger Day and International Burger Day.That gives restaurants several excuses to do promotions.Here are chains that have announced current burger deals.Del Taco: The chain is running a buy-one-get-one-free deal on Double Del Cheeseburgers for members of its Del Yeah! Rewards program on Saturday and Sunday, May 27-28, according to a news release.
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