Tourism Visa to China from Hong Kong

Hello, I want to travel to Shanghai in two weeks but I have no visa. At the moment I am in South Korea in bussiness and I found out that I can't get a visa to China from here, since I would need to have an alien card. This weekend though, I am travelling to Hong Kong for tourism from Friday evening to Sunday. I suppose the Chinese consulate on Hong Kong Island will be closed during the weekend. Do you know if I can apply for a tourism visa to China from the airport in Hong Kong during the weekend?? Thanks for your help.