Mostostal Warszawa S.A. was a co-organizer of the St. Florian's Day Fair which took place on 12 and 13 May 2007 on the Warsaw's Praga district. A Ministry to Artists and Sportsmen of the Warsaw-Praga Diocese was the principal organizer of the event, which was inaugurated by the capital's mayor Hanna Gronkiewicz-Waltz.