Here are some events I know of as follows that I either know about or will try to attend within the next few months.
April 23rd, Big Al's Mud Races
May 6-8 Moyie Mud Bog
June 4th, Dyno Day at Sam's Shop, Kettle Falls, Wa.
June 17-19 Mountain Mania Mud Bog (Chewelah, Wa.)
June 24, Montana Mudfest, Haugan Montana.