Chime in the Spring!
The Japanese Peace Bell was presented to the United Nations in June 1954 by the United Nations Association of Japan. It was cast from coins collected by people from 60 different countries, and housed in a typically Japanese structure, resembling a Shinto shrine, made of cypress wood.
If you're in New York on the 20th around 3:14pm (I think-times may vary, check your local listings) head down to the United Nations Building and you can hear the Peace Bell (日本の平和の鐘) chime. If that's too much trouble for you, try taking a Virtual Tour of the UN by clicking here. For the English-impaired, there's a Japanese version here.
I've given you plenty of notice, so there's no excuse for not celebrating Peace!