Hi Shah
I have only attended one SPSP (last year) and it was fantastic. You need to remember that there is a no vehicle movement on the property after dark policy in place, or at least there was last year. Which will mean walking down to the front gate in the dark. Last year I was up at the top house imaging and staying off site so I was tracking in the dark with red torch in hand. Bl**dy goats made me jump 10 feet when they moved around on one of the nights
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Off site I stayed at The Fairway Motel at a nearby town named Kandos. It is about 20 or 30 minute drive back to the motel but it is a very clean, neat and tidy country motel with a very friendly owner.
Wollongong is a city about an hours drive south of Sydney. Wiruna is a good 3 to 3.5 hour drive from Sydney West through the Blue Mountains then North from Lithgow on the road to Mudgee, turning off at Ilford. The event is very well sign posted and the organisers do such a fantastic job in organising and running the event
. You could go from Wollongong up to Campbelltown and then across to Penrith the Great Western Highway, it would be a good hour or more longer from Wollongong to Wiruna.
I can't think of public transport options to get you to/from SPSP, certainly a train service runs from Sydney to Wollongong and back. A hire car might be your best option, in my opinion.
As others have said it will be cold at Wiruna in May. Expect the nights to get down near zero, but the days should be nice in the high teens or low 20s or there abouts.
Good luck with your decision and hopefully this year the weather will be as good as last year.
Regards
Wayne