This is the 3292nd most frequent German word.
geburtstagsfeier
"Geburtstagsfeier" means "birthday celebration" in English.
Here, 'Geburtstagsfeier' is used as a noun indicating a planned event for someone's birthday celebration.
Die Geburtstagsfeier meiner Schwester findet morgen statt.
The birthday party of my sister will take place tomorrow.
In this example, 'Geburtstagsfeier' is used to describe the occasion that has already taken place.
Wir haben die Geburtstagsfeier meines Freundes draußen im Garten gefeiert.
We celebrated my friend's birthday party outside in the garden.
In this case, 'Geburtstagsfeier' references a future event for which preparations are being made.