noun
party, celebration
A1
Party: means 'party' or 'celebration'. It's a feminine noun (die Party) with plural die Partys (–s plural). Commonly used with preposition 'auf' (auf einer Party, auf die Party gehen). Informal, borrowed from English; declension follows weak noun patterns. Everyday usage.
Examples
Sie verließen die Party früh, weil das Wetter schlimmer wurde und kein Bus fuhr.
They left the party early because the weather got worse and no bus was running.
Am Samstag feiere ich meinen Geburtstag mit einer großen Party.
On Saturday I'm celebrating my birthday with a big party.
Die Party war eine große Feier für alle Freunde.
The celebration was a big event for all the friends.
Details
Mnemonics
imagine balloons and music at a Party
same as English 'party'
die -> imagine a feminine party banner (feminine)
Notes
Party is a loanword from English and is feminine in German. Plural can be Partys or Parties; both are used.