That would be good fun if you did it with the parents helping the children.Thanks Jaydee, some very good suggestions there. I'm definitely going to try a competition now, maybe which team can point out the various constellations.
I think the age mix of the people will be a problem - you have 9-11 year old children and some parents. It's hard to create a lesson that appeals to both children and adults. I taught adults - it's much easier.