English: CELEBRATION

Czech: OSLAVA (os-la-va)

Belgian (Flemish, French, German???):

Croatian: PROSLAVA (pro-slah-vah); SLAVLJE (slav-lie)

Estonian: TÄHISTAMINE

French: Célébration (célébración)

Greek: ΓΙΟΡΤΗ (YEEOR-TEE)

Italian:

Romanian: sărbătoare [ sar- ba- toa- re] 

Polish: ŚWIĘTO ( ʃ f i e n t o )

Portuguese: CELEBRAÇÃO (se-le-bra-ção)

Slovak: OSLAVA /oslava/

Spanish: CELEBRACIÓN (ce-le-bra-ción)