Holidays / Festival on Lord Budha BirthDay

I am Ashok from India, planning to visit Hangzhou in the mid of May 2014, The Birth Day of Lord Budha according to Indian calendar falls on May 14, 2014. I would like to know about the Holiday or Holidays in China for the Festival Celebration etc. in work places i.e offices / factories. The details answer will help me to finalize my tour planning. Thanks