
die Party
party
A private or public social event for celebrating, usually with music, dancing, food, and drinks.
Am Samstagabend gehen wir auf eine Geburtstagsparty.
On Saturday evening, we're going to a birthday party.
party
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party
A private or public social event for celebrating, usually with music, dancing, food, and drinks.
Am Samstagabend gehen wir auf eine Geburtstagsparty.
On Saturday evening, we're going to a birthday party.
For the word 'Party' (party), the preposition 'auf' is crucial. You use 'auf eine Party gehen' (to go to a party, accusative) for movement and 'auf einer Party sein' (to be at a party, dative) for location.
Gehst du heute Abend auch auf die Party von Julia?
Are you going to Julia's party tonight too?
To express that you are hosting a party, use the verbs 'eine Party geben' (to give/host a party) or 'eine Party machen' (to have a party). Colloquially, you also often hear 'eine Party schmeißen' (to throw a party).
Meine Nachbarn geben am Wochenende eine laute Party.
My neighbors are having a loud party this weekend.
'Party' (party) is often combined with the occasion for the celebration to form a new word. Typical examples are 'Geburtstagsparty' (birthday party), 'Abschiedsparty' (farewell party), or 'Überraschungsparty' (surprise party).
Die Kollegen organisieren eine Abschiedsparty für sie.
The colleagues are organizing a farewell party for her.
firm / fixed
Die Party refers to a social event held for celebration. The fest given here, on the other hand, is an adjective and, among the meanings listed, has no meaning referring to an event. It can describe a party more specifically, but it cannot be used as the name for one.

Die Party zu diesem Termin beginnt um acht Uhr.
The party on that date starts at eight o’clock.
Der Termin für die Feier steht jetzt fest.
The date for the celebration is now fixed.