Up to 2500 people are expected to attend the annual Burrawang Easter Market on Saturday on Hoddle Street in Burrawang from 8am to 3pm.
Between 6am to 4pm, Hoddle Street between Church Street and Region Street, and Crown Street between Hoddle Street and Range Street will be closed.
Motorists will not be able to turn onto McGraths Road or Burrawang Station Road from the Illawarra Highway.
A detour will be in place along Church Street to access Burrawang.
A reduced speed limit will be in place on the Illawarra Highway from 100km to 60km between Wilsons Road and Church Street.
Traffic is expected to be busy along the Illawarra Highway between 10am and 1pm.
Motorists driving through the area are advised to allow additional travel time, consider an alternative route via Sheepwash Road and Wildes Meadow Road, follow the directions of traffic controllers and be aware of increased pedestrian activity.