Taken from Wikkipedia-
Mount Panorama began as a dirt-track/tourist-drive carved out of the bald hills around the bustling city of Bathurst in the mid 1930s. The Council of the time, specifically Mayor Martin Griffin, had a vision for a premier motor racing circuit with the sharp hills, hairpin bends and a fast downhill straight that would inspire awe and demand respect from all who took up the challenge for years to come. Strong support from the New South Wales Light Car Club, Auto Cycle Union and the Federal Government, through a national employment relief scheme, saw this vision become a reality. On 17 March 1938 Mayor Martin Griffin declared the Mount Panorama Scenic Drive open. He always knew that the road was going to be used for motor racing but Depression Era funds weren't easy to come by, so he had to create a ruse. At Easter 1938 the first races were held and except for the war (WWII), have been run ever since.

Mount Panorama is indisputably a Mecca for motor racing fans all over Australia and around the world. On 16 April 1938, Mount Panorama attracted an overwhelming 20,000 spectators to its first race, The Australian Tourist Trophy.

My point.....So there is a lot of variety and themes possible on a yearly basis if imagination and planning was used properly