the motive behind the inspiration was not promoting the actions of Lego but the key idea that building things with an element of fun an play helps ignite hidden creativity and develop it also. At the Art Centre College,California a lot of these fun building blocks like toys and construction sets are used to explore forms and mechanisms helping people in the age group of 18-30 express their creativity.
I would like to view these events as seasonal episodes of the same project thus each event involving its share of unique activities & discussions, and leaving an incomplete but surprising end that leaves people to think. There could be parades, collective reading and sharing of people's stories, community events, plays/acts performed, special offers in certain partner food joints where every one could meet and acknowledge the day.
I feel that the postal service and consecutive gatherings could help in building this social network and help in discovering the foster families and the elderly living alone, as each member of the service will provide their personal details on becoming a part of the project. Another way could be that these new found relations could actually communicate with each other through the postal service thus expanding and continuing the network.