China: Postcrossing Meet-up in Shanghai

On Thursday I got two postcards from the recent Postcrossing Meet-up in Shanghai.

The first card shows a schematic map of Shanghai.

The card was signed during the meet-up.
It is prepaid and was added with two stamps:
???
Children's Sports and Games (from set of six) (issued 31-05-2015)

The second card is round and was sent by its designer.

Stamps:
The Great Wall (issued 01-05-2005)
Lantern Festival (from set of three) (issued 02-03-2018)
Paper Cutting (from set of four) (issued 24-01-2018)
Birds (from set of three) (issued 01-02-2002)

Thank You very much Lilith and Arlyna!