From the HaysPost.com:

Photo by Mark Conard

…in Nicodemus Saturday, June 25, 10 a.m.-4:30 p.m. [join us] as living historians guide you through a typical buffalo soldiers camp and regale you with tales of the Old West.

It’s a celebration of the all African-American regiments, known as the Buffalo Soldiers.

In 1866, these regiments were given full military status by Congress and the Army designated the 9th and 10th U.S. Cavalries.
From thehomeontherange.com:

The Nicodemus Buffalo Soldier Association was established in 1996 in Nicodemus, Kansas, with the purpose of performing historic cavalry maneuvers and sharing the history of America’s forgotten heroes. Most of the Nicodemus Buffalo Soldier Foundation members are from Nicodemus. Nicodemus, a National Park Historic Site about 50 miles northwest of Hays, is best known for its 19th century pioneers of African descent.

Nicodemus is about a 10 to 15 minute drive west from Webster State Park, which has an expanding set of trails.