Everharts will perform at Gayville Gayville Hall presents its two-hour music show, â�?�?The Hay Country Jamboree,â�?�? with special guests, old-time country�? music stars�? Bob and Sheila�? Everhart, on�? Saturday, May 31,�? at 8 p.m.�? in Gayville.�? �? �? The�? Everharts have been international ambassadors for American old-time country music for several decades, touring�? around the globe annually.�? They will host their 33nd annual National Old Time Country and Bluegrass Festival in LeMars, IA, in August.