That's a pretty cool idea; obvious ones that jump out at the moment are:
- Sawtell Chilli Festival
- Glen Innes Celtic Festival
- Parkes Elvis Festival
- Guyra Lamb and Potato Festival (Not really worth going to...)
- Tamworth Country Music Festival
- Bathurst 1000
I've not listed the Town Shows, but they're all through the years.
Hope that helps and fits in with your idea,
Ed