Visiting Guangzhou for Chinese new year.

I applied for a tourist visa category 'L' in october 2011 to visit Guangzhou for i had holiday from school. My visa application was returned with reason that i need an invitation letter of duly authorized unit from China. I could not get that cos i don't know anyone in China. I was told here that the officer suspects my intention was to go for the Canton Fair which was Oct.15- 19, 2011; Oct.23- 27, 2011; Oct.31- Nov.4 dates.
Now the fair is over and i am having a week break from school for the Chinese holiday. I would like to apply for a tourist visa and visit for 5 days. Do i still need to submit my application with the invitation letter of duly authorized unit from China? I don't have anyone there and can't get the requested letter from here. I visited China 2010 but did not require to submit this letter.