I came across a list, starts in June though, not sure about May.

Jun 3-5 Ceder Rapids Trade Show Productions

Jan 11-12 Adventureland, Des Moines Trade Show Productions

Jan 24-26 Des Moines Trade Show Productions

Jan 31-Feb 2 Ceder Rapids Trade Show Productions

Feb 7-9 Sioux City, Ia RK Shows

Feb 14-16 Council Bluffs RK Shows

Feb 21-23 Des Moines RK Shows

Feb 28-Mar 2 Cedar Rapids RK Shows

Mar 15-16 Lake View, Ken McBride

Mar 21-23 Ceder Rapids Trade ShowProductions

Mar 21-23 Council Bluffs RK Shows

Mar 28-30 Council Bluffs, Ia RK Shows

Apr 4-6 Ottumwa RK Shows

April 11-13 Des Moines Trade Show Productions

Aug 9-10 Sioux City RK Shows

Aug 22-24 Cedar Rapids, Ia RK Shows

Nov 1-2 Adventureland, Des Moines Trade Show Productions

Dec 26-28 Cedar Rapids RK Shows