Sunday, April 30: Prairie Wildflower Walk, 1:00 – 3:00 p.m., Sioux City Prairie. Celebrate Iowa Wildflower Week! Join wildflower enthusiast Rich Pope as he leads us on a walk to find early prairie bloomers. Wear sturdy walking shoes and dress for the weather. Meet at the Sioux City Prairie entrance adjacent to Briar Cliff University’s student parking lot near the Stark Student Center off W 32nd Street.