Charlie Todd plays by creating unexpected and joyful public scenes to bring people together. There are many people who join his plays. It gives an opportunity to smile for even more people who happen to be at those sites where the plays take place.Charlie shows in his talk how they use these scenes to bring joy to people.
You can also watch this video on TED page. It is especially useful if you need to see the transcript of his speech or get the translation in your language.