here is some more info i found from the cascade cruiser club.
The main event is being held at Browns Camp in Tillamook State Forest. Here is the link:
http://www.oregon.gov/ODF/TSF/browns.shtml As it says, there is only 29 camp spots within Browns Camp, so come early if you would like a spot in this campground! Directions from Portland are as follows: Follow State Highway 6 West from Forest Grove to the summit, milepost 33, and turn south on Beaver Dam Road. Follow the signs to Browns Camp.
If you would like to stay in a different, but near-by campground, here is a map of those campgrounds along with links for more info:
http://www.oregon.gov/ODF/TSF/camping.shtml NOTE! STAGECOACH CAMPGROUND IS CLOSED!!!
You may also camp in any of the available dispersed camping sites scattered throughout the forest. Please note that these sites will not have bathrooms and/or water.
Please be aware that there are fire restrictions in effect. You can find that information here:
http://www.oregon.gov/ODF/TSF/docs/09docs/RegUseGuide.pdf
If you have any other questions that I failed to answer, post them up here and we will be more than happy to answer them!