Bring about celebration (8)
I believe the answer is:
occasion
I believe this clue is a double definition.
'bring about' is the first definition.
(thesaurus)
'celebration' is the second definition.
(thesaurus)
(Other definitions for occasion that I've seen before include "Cause - event" , "call" , "Time of a particular event" , "Time when an event takes place" , "Opportunity" .)