Other things we talked about in our groups of 3 is who is going to be in the competition, what age groups are there going to be and what prizes there also where we are going to get them.
I think we could get all the schools who are going to be participating in a space were everyone will fit and we can talk about about what the competition is about. Then we might give them the colouring sheets and let them go and start the colouring.
That's my ideas on the colouring competition, if you have any other ideas comment on my post.