I would like to attend Guangzhou Trade Fair 18-19 April 2015 (session 1)

Hi, I'm Davis from Indonesia. my flight route will be from Kuala Lumpur, Malaysia direct to Guangzhou.
Realize that I don't have enough time to apply for visa in Indonesia (Jakarta), could I get VOA at Guangzhou if I got invitation from the trade fair exhibitor?

If my entry point is from Hong Kong to Shenzhen and with the TRADE FAIR INVITATION at hand, would I be permited to travel from Shenzhen to Guangzhou to attend Guangzhou Trade Fair?

Please KINDLY reply ASAP and Thank You in Advance.

Best Regards
Davis