Saturday & Sunday, July 22 & 23: Koloa Plantation Days Rodeo.  Hawaiian paniolo (cowboys and cowgirls) have been top rodeo competitors since Ikua Purdy of Waimea, Hawai`i, won a national roping contest in Wyoming in 1908. From little keiki on up, ropers and riders throughout Hawai`i compete in numerous events every year. See bull riding, double mugging, team roping, open barrel racing, rescue race, women’s breakaway roping, steer un-decorating, the iron horse race and the Hawaiian classic po`o wai u,…