Organising any recent celebration (9)
I believe the answer is:
centenary
'celebration' is the definition.
(I've seen this before)
'organising any recent' is the wordplay.
'organising' indicates anagramming the letters.
'any'+'recent'='anyrecent'
'anyrecent' with letters rearranged gives 'CENTENARY'.
(Other definitions for centenary that I've seen before include "significant anniversary" , "100th anniversary" , "special occasion" , "One hundredth anniversary" , "... so celebrating this next month" .)