OK, I checked both (FT) Fat Tire Series and (PS) Psycowpath Series and here are upcoming races that are four hours or less drive time.
April 4th – (PS) Maskentine, Norfolk NE (4 hrs away)
April 19th – (FT) Le Tour de Tick, Neosho MO (3hrs)
May 2nd – (PS) River City Shootout, Bellevue NE (2hrs)
May 9th – (PS) Battle Royale, Platt River NE (????)
May 23rd – (PS) Lewis and Clark, Council Bluffs IA (2hrs)