"PARTY-TIME!" or "LET'S GET THIS PARTY STARTED!!" :)
We're having a party (we're enjoying ourselves)
we are going to the party
The full and correct expression is 'le monde est à la fete' which means the whole world is rejoicing
Music Festival.
c'est la première - it's the first (feminine)
Christmas time at home
La date de la fete des peres
Either the ballet celebration or the ballet festival
La fete du citron is something.
I don't recognise this. It looks and sounds very like c'est la notre. That means 'this is ours.'
French
Literally - So, it is the festival. Actually - All the fun of the fair.
"It's not a holiday for everyone".