Fire people for childish event (4,4)
I believe the answer is:
sack race
'childish event' is the definition.
'sack race' can be an answer for 'event' (humorous sporting event). I'm not sure about the 'childish' bit.
'fire people' is the wordplay.
'fire' becomes 'sack' (dismiss someone from their job).
'people' becomes 'race' (people can mean a national group or race).
'sack'+'race'='SACK-RACE'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for sack race that I've seen before include "Jumping contest" , "event - with 10d" , "athletics contest" , "Get rid of nation" , "jumping event" .)