OK, so I set an unfortunate precedent last year, but now DS says we have to do a "making things thing" at his party. He will be 5, party theme is "Space", ~25 children - ideas please, please, please...
constraints are - it has to be indoors (village hall) and it has to be something which other people's children in party clothes can safely do.
I have been vaguely thinking about it for weeks and have got nowhere and now I am running out of time.