I would like to visit Shanghai for the ALL IN PRINT exhibition.

You need a business visa to visit Shanghai for the ALL IN PRINT exhibition, do you have
1. A No-objection letter from your company;
2. An invitation from CHINA with a copy of the inviter's license

Otherwise, you have to apply for a tourist visa to China, but you can't click the purpose of coming to China for IN PRINT exhibition on the visa application form, you write that the major purpose of coming to China for Tourism.
You need to provide A No-objection letter from your company stating your position ,monthly or yearly salary;