Actually, I saw that the ROS/ROS2 community is really active in the other region, e.g America, and they have been holding the relevant offline meetups. I think that the robotics is a multi-discipline topic and the experience exchange and sharing can benefit everyone, in addition, US and China have been the largest ROS/ROS2 user community in the world, why not join together to organize some meetups to extend and share your expertise to benefit more in China ? 
There are already large groups. Are you in China?
Yes, I’m in Shanghai, what’s the large group mentioned by you ?
Could you please share me and I’d like to join you 
thanks !
I guess, these get created by individuals and can take a max of 500 users.
ROS全球开发者1号群 is one of them… as the group grows #2 is created and so on…
great, thanks. could you please share the QR code of the group here or send it to me if it’s not allowed to publish publicly here ?