just checked with the Bureau of meteorology, weather looks to be alright. If it rains bring an umbrella

The show will go on. it rained last year & there was still over 100 cars there.
Partly cloudy. Isolated showers along the coastal fringe late in the morning. Light winds tending northeasterly up to 25 km/h during the afternoon.
City Centre. Min14 Max23
Penrith Min11 Max26