Bayfield Pharmacy Walker’s Do It Best Hardware in IgnacioHandlebar Motorsports Fender MendersLa Plata County Fair Grounds Durango Muffler The derby is slated for Saturday, Aug. 11 with gates opening at 10 a.m. and show time at noon. The 2018 La Plata County Fair will be held Aug. 8-12 at the La Plata County Fairgrounds. Five days of fun will feature entertainment for the whole family including a rodeo, carnival, displays, livestock auction, dancing, food, and concert by Sundance Head on Friday night.