In Portland, we do one a month and the last Saturday every month. But for like, week long rendezvous, there is:
Buckeye, Northern CA (June?July?)
Echoes in Time, Salem OR (July)
Saskatoon, Twisp WA (July?)
Rabbitstick, Rexburg, ID (sept.)
Firefly, North Carolina, (July?)
These are all "Primitive Skills" gatherings, not necessarily "Rewild Camps". But you can learn some amazing stuff there for rewilding.