CF- leaving do-- what to do?

[Boxshibe]

A much loved colleague is leaving end of this week. Due to our management not realising this or forgetting nothing had been organised.
So last week I started organising an evening out. Booking a restaurant and drinks after. Getting pre orders, paying for the deposits etc. I set up a teams chat and invited people who know her .
someone I invited it turns out is also leaving (I didn't know, don't work with them) has announced that this will also be their leaving do! And can they input on what we do and invite people!
Can I tell them to but out and organise there own or grin and bear it!
He'll totally change the dynamic of the dinner and drinks
I think he's being a massive CF and it should be up to his manager to sort it.
Aibu?

If he's leaving on the same date, then it will be difficult for him to select a different date.
I'd go back and say that the restaurant is already booked and organised for original colleague, but do feel free to join you after for drinks.

Yanbu! No bridges to burn so go nuclear

The thing is that if he comes and you are presenting your friend with a leaving gift etc he will want something too.

UPDATE- Unfortunately in the last 24hrs the colleague who was being thrown the party has had a death in the family. So we have cancelled. CF asked if it could still go ahead as his!!!
I said no and cancelled the dinner etc
CF!!

Your poor colleague. The CF showed his colours!

OMFG HOW RUDE IS CF COLLEAGUE! NO SYMPATHY

Oh my god! He sounds like a real piece of work. Thank you for the update because I was wondering!