vašar

1. fair; country fair
   Deca su na vašaru jela šećernu vunu. — The kids ate cotton candy at the fair.
   Svake godine u selu se održava vašar za Petrovdan. — Every year there's a fair in the village on St. Peter's Day.
2. colloq. derog. circus; madhouse
   Ova sednica je pravi vašar, niko nikoga ne sluša. — This meeting is a real circus, nobody listens to anyone.

Sajam usually means a large trade fair or exhibition, while vašar is a folk fair with stalls and rides.