From the City:
Pick Up the Princess Highway from Narre Warren (if you follow all the signs pointing to "Warragul" this will put you on the princess highway eventually), Drive down it through Pakenham, and continue east until you get to Trafalgar. 

Drive through the town towards Trafalgar East, you will see a turn off on the right, marked Delhuntie, or Cemetary, turn right onto this road and take the left onto the service road. 

Drive along the service road which follows the highway, until you see a cemetary, take the road to the right just before the cemetary (it should be between a bus stop and the cemetary) which goes up a steep hill and curves to the left. There will be two turn offs just past the sharp curve, the first will take you to a large two story house, the second will take you past a park, and a tree house.  Take the second turn off, and drive past the tree house.

Once past the tree house you can keep going straight, which will curve you around the right side of the smaller lake to the front entrance of the Venue, or alternately you can turn left and go between the two lakes to the rear entrance.

I recommend going straight, as you will need to carry your gear a shorter distance to the front entrance of the building.
 


From Gippsland:
Drive to the town of Trafalgar via the Princess Highway, go to Trafalgar east and follow the service road until you get to the road next to the cemetary, drive up the steep hill, and take the second right after the sharp turn to the left. Follow the dirt road and either go left between the lakes or go straight and drive around the right side of the lake.  This will get you to a large Mudbrick Building where the event is.

I recommend going straight, as you will need to carry your gear a shorter distance to the front entrance of the building.