My jape is silly, overshadowing isolated overnight events (6,7)

I believe the answer is:

pyjama parties

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

'my jape is silly overshadowing isolated overnight' is the definition.
I know nothing about this answer so I can't tell whether this works.

'events' is the wordplay.
I cannot really understand how this works, but
'events' could be 'parties' (party is a kind of event) and 'parties' is located in the answer.
The remaining letters 'pyjama' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.

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