fony3 - As you pass Gasoline Alley exits on the QE2 you will proceed north on 50th (Gaetz) Avenue, effectively exiting the freeway as it curves to the left (west) so remain in the right lane as you approach Red Neck Deer.
Carry on to the first light. That's 19th street, usually referred to locally as Delborne Road. Velnor Leisure Products RV will be on your right. Turn right (east) at that light onto 19th street. There will be a traffic light again by the rear of Velnor Leisure products at which point you'll see the Westerner Park signage, the Enmax Centrium and other Westerner Park fairgrounds facilities. That's 49th avenue. Turn right at that light (now heading back south on 49th ave) and proceed to the parking entrance gate on your left about a block south - the only left turn in about ten blocks of the Westerner Park Grounds so you can't miss it.