Social occasions delivered initially by private political organisations (6,7)

I believe the answer is:

dinner parties

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

'social occasions' is the definition.
(a dinner party is a type of social occasion)

'delivered initially by private political organisations' is the wordplay.
I cannot really see how this works, but
'private' could be 'inner' (as in one's private or inner thoughts) and 'inner' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Times.

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