Entry into China is carried out under the visa regime, but the process of obtaining it is not very difficlult. Getting a visa for entering to China has small specificities for each country of departure. Below we give a few key points that you should know.
For a summer seminar (up to several months) you can issue a tourist or business visa (do not confuse it with a work visa). This visa does not require invitations or other documents from the Chinese side.