KC Improv Company to require proof of vaccination for shows Following KC's mask mandate KC Improv Company to require proof of vaccination for shows and last updated 2021-08-04 00:27:09-04 KANSAS CITY, Mo. â An increasing number of businesses in the Kansas City-area are requiring proof of vaccination before entering their establishments. "When the mask mandate came down and we realized if we donât limit the theater to just those that have been vaccinated, then everyone has to wear masks, including our actors on stage, and we donât want to give an inferior experience to our customers and our patrons," said Tim Marks, owner of The KC Improv Company.