Since when do you need permission from anyone to arrange a camping trip with friends?
The issue is if you have "permission" from the Congregation then it is a "church" organized event and the church can be held liable for incidents that occur, ie, injuries, abuse, etc. This is why years ago the KM and WT letters instructed that NO such events were to be organized as a congregation event. No Cong picnics or parties or trips (even to Bethel). Any person organizing any such event was doing it "personally" and was "personally liable".