We've created a mattermost team for quick communications/share of information if needed:
https://mattermost.web.cern.ch/signup_user_complete/?id=y7tdyfkucj8b8x8z8fe6bfre4y&md=link&sbr=su
Then you'll be able to join the dedicated channel:
https://mattermost.web.cern.ch/comcha/channels/3rd-comcha-lectures
