Here are schedules for the 2019 4th of July available by pdf download.
Dusk, Fireworks above the open cut in Lead, SD https://leadmethere.org/local-events/july4th/
97th Annual Black Hills Roundup in Belle, fireworks after the rodeo on July 3rd http://www.blackhillsroundup.com/rodeo-schedule/
Custer's Old Time Country Fourth, fireworks at Pageant Hill on the 4th at dark http://www.visitcuster.com/chamber/events/fourthofjuly/
Rapid City fireworks on both the 3rd (after the Post 22 game at Fitzgerald Stadium and the 4th at Memorial Park) http://rapidcityjournal.com/news/black-hills-fourth-of-july-fireworks-and-activities/article_4010952a-a1da-11e0-b0fa-001cc4c03286.html