 GREENWOOD VILLAGE, Colo.--BUSINESS WIRE--Red Robin Gourmet Burgers, Inc. NASDAQ:RRGB Red Robin or the Company, a full-service restaurant chain serving an innovative selection of high-quality gourmet burgers in a family-friendly atmosphere, today reported financial results for the quarter ended July 11, 2021. Key Highlights Restaurant revenue of 272.2 million and Restaurant Level Operating Profit as a percentage of restaurant revenue a non-GAAP metric of 15.7; Second quarter 2021 c 