Wouldn't entirely shock me if his drink got spiked with Molly.
As someone who has been there (granted on the infield level, not where Welker was), the Kentucky Derby is an utter sh*tshow. A million things going on. Lots of debauchery. Also, one of the greatest sporting events I've been to in person. So much fun.
I also wouldn't be shocked if he decided to do Molly there, either. Its during his offseason and if he wanted to experiment, the Derby wouldn't have been the worst of places to try it.