Went to the event at Princess Hall today. Best part had to be the dustbin/recycling lorry parked outside, which children could go in and push most of the buttons - to make the truck go up and down, honk the horn, flash the lights, make the drivers seat go up and down, open and close the doors etc.
Making a hedgehog from clay and plastic straws was fun as well, but it didn't have the long lasting appeal of the dustbin/recycling lorry.