 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 provided a business update, including preliminary, unaudited comparable restaurant revenue results for the fourth quarter ended December 27, 2020. Paul J.B. Murphy III, Red Robins President and Chief Executive Officer, said, During an unpre 