'party time' in french is 'heure de la fête'
You can say "Où est la fête ?" in French to ask where the party is.
medu
un parti
fete sur
In Cajun French, you would say "la fête" to mean party.
Let's Party in French: faisons la fête
The term "second-party" is not commonly used in French. If you are referring to a business relationship where one company is closely affiliated with another, you could use the phrase "partenaire étroit" or "partenaire affilié" in French.
grande fete
Organiser une fête OR organiser un party
you can say une fete d art
A party is "une fête" (feminine noun) in French. A black and white party is "une fête noire et blanche".