We always go to Jumbo Rocks Camp Ground. There a lot of camping sites there. If you go all the way into the campground, about the last loop on the right before you get to the end (don't remember the camp site numbers there - maybe someone else will say if they know) is where we normally go. First ones there on Friday afternoon usually set up a couple/few big cameras/tripods so everyone can find us. I'm guessing that there may be a good group this year - maybe over 20 because it's the last "official" year for Per to be organizing it.
Hope you find your way there OK. Always good to have new people come.