China Visa on Arrival

Hi i am coming from India to visit an exhibition in Guangzhou from Feb 28-March 2 and meet some suppliers with whom we have been doing business since the past 3 years. For unknown reasons, the chinese consulate has suddenly decided to take 8 days instead of the regular 4 days to issue a visa. I cannot get a visa in Mumbai in time now, since they will give it to me on March 3 (after the show gets over). Is there any way i can get a visa on arrival?