Butler Community College will host KOCH Day on the El Dorado campus, Sept. 9, as an opportunity for area high school and college students, as well as members of the public to explore career options and to make valuable career connections with members of KOCH companies. The day will feature two repeated sessions, the first from 9 a.m. to noon. and the second from 1 to 4 p.m. A free lunch will be provided from noon to 1 p.m. The event will be held in the Hubbard Welcome Center, 901 S. Haverhill Road in El Dorado.