sazvati

1. (of a meeting, session) to convene; to call
   Direktor je sazvao hitan sastanak. — The director called an urgent meeting.
   Stranka je sazvala konferenciju za medije. — The party called a press conference.
2. (of people) to summon; to gather
   Sazvala je celu porodicu na ručak. — She gathered the whole family for lunch.

The imperfective is sazivati.