Hi there,
Tim might explain best, but you are correct mostly birthdays (auto generated) and some of the events have been listed, sadly a bit trashed this year by Covid-19.
With regard to the September meet-up, try searching Sleepover in the search panel (top left hand corner) and it should come up with the page for this September's and past sleepover events, to give you an idea.
The search is really useful as it will help find all sort of items, before starting a new thread.
Enjoy
Pete
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Pete and Sue.