Central Plains Dairy Expo features sustainable technologies, thought-provoking presentations This dairy-centric show heralds free educational programming, entertainment and dairy foods The Central Plains Dairy Expo (CPDE), March 29-31, in Sioux Falls, S.D., showcases 300-plus exhibitors and innovative products, services and technologies, informative breakout sessions and free entertainment. CPDE kicks off at 5:30 p.m. on March 29, with the Welcome Reception – featuring Charlie Berens, host of the Manitowoc Minute. This free, fun and entertaining kick-off reception runs until 8:30 p.m.