posećivati

1. (people, places) to visit
   Vikendom često posećujemo baku na selu. — At weekends we often visit our grandma in the village.
   Ovaj sajt posećuju hiljade ljudi dnevno. — Thousands of people visit this site every day.
2. (events, classes) to attend; to go to
   Redovno posećuje koncerte i pozorišne predstave. — He regularly goes to concerts and plays.
   Deca posećuju časove plivanja dva puta nedeljno. — The children attend swimming lessons twice a week.

The perfective is posetiti; the person or place visited is in the accusative: posećivati baku.