One thing I started doing this year as ACM for our camping outings is to invite parents/scouts that do not wish to actualy campout over night to attend the activities durring the day. We have gotten a handful of scouts that otherwise wouldnt have attended the event now comming for the day which is much better than them not coming at all. This way they get to show up and get a feel for the campout, and maybe next year they will decide they wish to stay overnight.