we recognise that objectification of female bodies contributes to unequal treatment of women and that no workplace that supports equality would want to partake in that.
Because France does not and the workplace is still like a Benny Hill skit...
Where we differ is that we do not equate Lido and strippers, skilful dancing and base objectification, and we see enough nipples and bum, male and female every day that we are not unduly titillated by the beautiful male and female dancers of the Lido. We just admire their skills, form, and the whole extravagant show. Maybe we are a bit more relaxed.
It's like having a beautiful nude sculpture, male or female. You do not want to boink it, it is not for sex.
And yes, a Lido, or Moulin Rouge celebration is not so out there in France. Op's French colleagues may have expected to go. I am not saying that they will hate their British colleagues, but the alternative proposed better be nicer than the very touristy stuff that has been proposed in the thread.
Fwiw, we French have to adjust a little to the piss ups that are the traditional British Christmas party (I love them now :) ).