I've had a few people stop by searching for a gun show in Fort Dodge. My links to gun shows in Iowa didn't have one for that town, so I did a quick search and found it.
FEBRUARY 27 & 28, 2010, Fort Dodge, Iowa
38th Year - Original R & P Club Show, Sponsored by the Rifle & Pistol Club
WEBSTER COUNTY FAIR GROUNDS
Hwy 169 - 2 miles South of Jct. Old 20 & 169
Saturday; 9:00 a.m. to 5:00 p.m.
Sunday: 9:00 a.m. to 3:00 p.m.
Food & Beverages Available, Admission $5.00, Free Parking
I found this from The Shooter's Outlet in Arcadia, IA.