How did you celebrate Diwali?

Barack Obama celebrated Diwali by lighting the ceremonial lamp at the White House amidst chanting of Vedic mantras seeking world peace, becoming the first US president to personally grace the occasion.
Two days later, Diwali was celebrated for the first time at 10, Downing Street, with similar chanting of Vedic prayers for world peace. Britain's prime minister Gordon Brown termed it a "historic event".
More than 50,000 people in Melbourne, Australia, gathered at the Federation Square to celebrate Diwali. The celebration was also attended by the premier of Victoria, John Brumby.

How did you celebrate Diwali? What does the festival of light and peace mean to you?