Friday, August 19th on the solar calendar (July 20th on the lunar), was the Chinese god of wealth's birthday. Almost every business, some all day, would shoot-off fireworks to celebrate on this day. It is believed that the more fireworks you do, the better your business will do in the coming year. I personally think they would have better profits if they better invested their money or just simply saved it, instead of spending so much on an old superstition. Chinese do love their fireworks and any excuse is good enough.