On Sept. 18.
* Offer is valid only at participating restaurants on September 18, 2018. Valid on dine-in only. Not valid for to-go, online, 3rd party delivery or catering orders. Offer is for one $5 Gourmet Cheeseburger for each adult size beverage purchase. Discounted burger does not include modifications or add-ons. Not valid with any other offer or discount including Red Robin Royalty® offers. Discounted burger does not count towards Royalty Buy 9 Get the 10th Free reward.