Do you have a junior section?
In our club we now have a junior secretary that organises around 4 comps a year on club boats. This is predominantly on their family boats. We charge £5 a child and there is a prize for all at the end. We also arrange charter trips for them, just 4 hours which the club members have subsidised. We're up to around 12 junior members now which considering we have less than 50 senior members isn't bad.