You come to Shanghai at right time. It's spring festival around China from 13th to the end of Feb. It's almost coldest days in Shanghai, but never boring, you will hear the firecrackers every night, the most strong loud at 17th, cause it says wealth god will come at 0 oclock 2nd day. I suggest you take a ear-plug to avoid frighten your heart. Maybe you are brave enough to fire a cracker to enjoy.