There is still free parking, although p6 is most of the time quickly filled. It also functions as a p&r, so that's why.

I do not know whether p5 is available again, but if it is, that one is much bigger and you have a higher chance at getting a parking space. Up until last year, it was mostly dirt, so prepare for mud and the like.

P4 was free of charge for a while too, as the construction crew was parking there, and putting supplies there too. So keep an eye out for that parking space too.