I didn't do over nighters, but I would say remove it, what if your horse gets stuck in the hay bag in the middle of the night?? If the horse got out of the yard, there a gate to stop the horse leaving the grounds and usually they go straight to another horse or feed bin....just ask when you get there and maybe put a breakaway halter on.
Also, i'm not sure what your rules are there but here you MUST wear your helemt when your in the yard. At my pony club they let it slide if the graders (certificate graders) wheren't there.
Basically we did anything we wanted to because we were the older ones within reason though.
If in doubt, ask. Usually the kids know what's going on more then you think.