Social event for bachelor before a French boxing match (8)

I believe the answer is:

bunfight

I'm a little stuck... Click here to teach me more about this clue!

'social event' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?

'bachelor before a french boxing match' is the wordplay.
'bachelor' becomes 'B' (abbreviation e.g. BA=Bachelor of Arts).
'before' says to put letters next to each other.
'a french' becomes 'un' ('a' in French).
'boxing match' becomes 'fight' (I've seen this in another clue).
'b'+'un'+'fight'='BUNFIGHT'

'for' is the link.

Can you help me to learn more?

(Other definitions for bunfight that I've seen before include "Tea party (slang)" , "Grand tea party - huge argument" .)

I've seen this clue in The Daily Express.

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