A class discussion-board (Ed) will be available on Courseworks. Ed should be used for items of a general interest that require a prompt response, or that announce something of relevance to the class (e.g., group norms, a URL relevant to the current project) that may have usefulness for others before the next class. Both the TA and the instructor will monitor the web board regularly. Items that don't require a prompt response should be saved for discussion in class.
Students should monitor Ed regularly. Announcements by the instructor or TA will be made there if they are time-sensitive. For example, a clarification of the parameters for a tournament might be posted there.
You are also welcome to create your own channels in Slack for each of your project groups.