City of Sioux City recently issued the following announcement on October 06.
The Sioux City Parks and Recreation Department wishes to inform the public Nebraska Interscholastic Cycling League will host a mountain bike race at Bacon Creek Park on Saturday, October 9, 2021 from 11:00 a.m. to 5:00 p.m. and Sunday, October 10, 2021 from 7:00 a.m. to 3:30 p.m.
The Park, including the paved trail and dog park, will remain open during the event and event volunteers will be available to assist park users during the event.
Original source can be found here.