"Ukraine Makes Birthday of Nazi Collaborator a National Holiday and Bans Book Critical of Anti-Semitic Leader"

https://www.newsweek.com/ukraine-nazi-collaborator-birthday-holiday-anti-semitic-1272911

The holiday was announced as a day of commemoration. But it is still celebrated "unofficially" by groups like the CYM - not just in Ukraine but also around the world:

"Day of Commemoration of the Death of OUN Leader Stepan Bandera" (2021)

https://cym.org/en/au/stepan-bandera-commemoration-2021/