MITCHELL, S.D. (MITCHELLNOW) Mitchell High School officials have announced the first day of school will be Wednesday, August 20th. Registration Day is set for Wednesday, July 30 with two registration sessions from 9 a.m. to noon and 1 to 4 p.m.  A Fall Activities Meeting is also set for Tuesday, August 5th at 7 p.m. at the Performing Arts Center. Get more information on the Mitchell High School website.