Celebrate National Oatmeal Cookie Day with Thirstday Night Trivia: Oatmeal Cookie Day at Lost Hiker Brewing Company. Oat-based treats have fueled people since Roman times, with Scottish oatcakes delivering quick energy boosts throughout the Middle Ages. Put your knowledge to the test, roll your OATs down to Midtown, and bring a meal—or cookies—to enjoy during trivia. Trivia starts at 6:30 PM. Outside food and cookies are always welcome.