School Bike Breakfast - you encourage the kids to get on their bikes/scooters etc to get to school (nice and early too), where you lay on various things such as croisants and bacon butties, stickers and reflective gear to buy, then get along some other folk to do things like bike maintenance, recycling, cycle training, slow bike races etc.
I've organised one in the past, luckily I didn't have to this time. At the one I organised I had about 1/3 of the school cycle to school (100 bikes) and as I was organising it the previous time I had to be at school for 7.30 am. It did have a knock on effect afterwards for a while, though it obviously diminishes over time.
Bike Breakfasts can be as much or little as you want - your local council "Safe Routes to School" team would be able to give advice on whether they come along and help run one.