According to the article at the following link:
The Kevin Costner concert, which was held on March 20 in Gdynia has been canceled. U.S. actor and director, had this time to present itself in the role of music and play with his band Modern West. The appeal concert PAP Hanna informed the Speaker of the Baltic Artistic Agency BART, which was the organizer of the concert in Gdynia. The event was canceled for “reasons beyond the organizers’. -. – Today I can not say anything more about this cause. We apply the confidentiality of the talks – she explained.