Une fête (feminine) is a party
à une fête means in a party, during a party
An afternoon party/fete/event for baby Labbe
a funfair
bonnee fete benoit amuse toi bien
before a party
we are going to the party
The National Music Day (le vingt-et-un juin)
Our own party / celebration.
forgone conclusion...matter of fact
smoke monkey balls
Music Festival.
Feast of the Mothers - Mother's Day
The full and correct expression is 'le monde est à la fete' which means the whole world is rejoicing