(NASDAQ:RRGB) Guests can mark their calendars to enjoy these bold new bites starting Sept. 8 ENGLEWOOD, Colo., Sept. 3, 2025 /PRNewswire/ -- Red Robin Gourmet Burgers, Inc. (NASDAQ: RRGB) is introducing its new menu that's full of bold burgers, abundant entrées and playful sips, plus the return of a...