This is the 17602nd most frequent Polish word.
zebranie
Meeting.
In this sentence, 'zebranie' is used to describe the event for which a report needs to be prepared.
Muszę przygotować referat na zebranie.
I need to prepare a report for the meeting.
In this context, 'zebranie' specifies the board-level meeting taking place.
Zebranie zarządu odbędzie się jutro o 10:00.
The board meeting will take place tomorrow at 10:00.
Here, 'zebranie' is used to mean a formal meeting or gathering.