Where to stay
Here is a good place to start:
The trial site is on the north side of Corvallis, about 5 miles from the center of town. It is about 8 miles west of Albany, and 16 miles south of Monmouth. Salem is 32 miles north of the site, and should have plenty of lodging available. There is not a home football game for U of O in Eugene, so lodging should be more plentiful and cheaper there. Eugene is about 50 miles south of the trial site.
For camping sites, here is a starting place: