Why do we celebrate Valentine's Day?

      Today is Qixi (Double Seventh )Valentine's day is one of the  Chinese traditional festivals. It falls on the 7th day of the 7th Chinese Lunar Month. Now people usually give flowers, chocolates or other presents to their sweethearts, instead of doing traditional customs. The romantic legend or fairy tail has taken deeply root in the hearts of Chinese people, the cowherd(Niulang) and weaver girl(Zhinu). The goddess separated them by a river of a stars(Milky Way), but allowed them to meet each other once a year. So today is their reunion day, so sad and touching story.