Accessibility StatementSkip Navigation Guests can grab their broomsticks and head into Red Robin to enjoy the Mega Monster Burger, Mad Scientist Margarita and spook-tacular deals starting Sept. 29 ENGLEWOOD, Colo., Sept. 25, 2025 /PRNewswire/ --Â Red Robin Gourmet Burgers, Inc. (NASDAQ: RRGB) is summoning the spirits of Halloween with a frighteningly tastylineup of limited-time offerings to awaken taste buds from the grave at participating locations. Red Robin's new Mega Monster Burger, Candied Orange Fizzy ...