Red Robin offers a $20 Bottomless Burger Pass

Red Robin has announced it will be selling a limited number of $20 passes entitling holders to a free burger and side every day in May.
The Bottomless Burger Pass will go on sale at 9 a.m. Mountain time on Thursday, April 17, according to the Colorado-based chain’s website.
That means it will be available at 8 a.m. Pacific time in Southern California, but most likely only for a very short time.
Red Robin cautions the passes could sell out in minutes, and usually in these kinds of promotion