познакомившиеся

познакомившиеся

"Познакомившиеся" means "those who have met or gotten acquainted."

Here, 'познакомившиеся' is used as the nominative plural participle to describe students (subject of the sentence) who got to know each other.

Познакомившиеся на мероприятии студенты сразу почувствовали симпатию друг к другу.

The students who met at the event immediately felt an affection for each other.

In this sentence, 'познакомившимся' is used as the dative plural participle to refer to those who interacted with the project, indicating 'to whom' we are grateful.

Мы благодарны всем, познакомившимся с нашим проектом и поддержавшим его.

We are grateful to everyone who familiarized themselves with our project and supported it.

Here, 'познакомившихся' is employed in the genitive plural to qualify a group of individuals associated with the traditions.

Эти впечатления останутся у познакомившихся с этими традициями.

These impressions will remain with those who became acquainted with these traditions.