This is the 10467th most frequent Russian word.
вечеринок
The Russian word "вечеринок" is the genitive plural form of "вечеринка," meaning "party."
In this sentence, 'вечеринок' is used in its genitive plural form to indicate the number of parties.
Вчера я посетила три вечеринки за один вечер.
Yesterday, I attended three parties in one evening.
Here, 'вечеринок' is used in its genitive plural form to denote the object of preparation or arrangement.
Мы готовимся к организации школьных вечеринок.
We are preparing for organizing school parties.
In this context, 'вечеринок' is utilized in its genitive plural form to specify 'from past parties'.