Attend the Fried Onion Burger Day Festival in downtown El Reno to witness the cooking of the world's largest fried onion hamburger, weighing over 850 lbs. This annual event is a tribute to the popular fried onion hamburgers that have been cooked daily in diners and cafes throughout El Reno since the early 1900s. This El Reno festival attracts over 20,000 visitors each year, and also includes games, live entertainment and more. Browse rows of classic cars in the festival's car and motorcycle show, or enjoy shopping for handmade goods and merchandise in a wide variety of craft and vendor booths. Clowns and magicians will be on hand to entertain the kids, while a burger eating contest invites participants to chow down on delicious onion burgers in the hopes of claiming the top prize.