Denny’s: Denny’s Rewards members can get 20% off any burger on the menu for NationalCheeseburgerDay. Friendly’s: Friendly’s Fan Club members can get $2 off all cheeseburgers from Sept. 18-20.
18, burger lovers will celebrate NationalCheeseburgerDay ... 18 to score the deal. McDonald’s customers who order in the chain’s app can enjoy a 50-cent double cheeseburger on Sept. 18.
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