A hen party would be a 'sortie / fête / partie entre filles' in French. If going to a hen party specifically just before getting married, it can be called 'enterrement de vie de jeune fille' (literally 'the burial of a maiden's life')
Well, la poule français means French chicken... I don't think you can say the French hen. I'm not too sure of the English version but une poule is an egg laying chicken, which I believe is a hen in English so "la poule française" is correct.
the Hen Hotel would be called "l'hotel de la poule" in French. If this is only about hens, a hen house or hen coop is "un poulailler" (masc.).
A hen is 'une poule' in French.
In Cajun French, you would say "la fête" to mean party.
'party time' in french is 'heure de la fête'
You can say "Où est la fête ?" in French to ask where the party is.
fete sur
un parti
medu
Let's Party in French: faisons la fête
A spinster party is basically a bachelorette or hen party
More Unique behavior and ideas for stag weekends, stag nights, hen parties. It is so more combination of hen and stage such as hen stage party.