We have a Google discussion group for our workshop, which you'll be invited to following your acceptance into the GDW. It is fairly low-traffic and you can control how often you get notifications of new messages: immediately, daily summaries, or every 25 messages (not recommended, as typically that may take weeks or months!).
We use the group for discussion of anything that may be of interest to the GDW membership … talk about game design, interesting new games, suggestions for tools, jobs offered or sought, etc. The only limitation is no commercial spam or harassment. As this is an invitation-only group we've never had any trouble with inappropriate posting, but if you have complaints send them to Juan (or one of the other organizers if your complaint is about Juan!)
We usually post notifications about our upcoming workshops and GDC dinners there, but also try to send a notice about those to everyone's email address. However, what with crowded mailboxes and changing email addresses and spam filters, we find sometimes those emails don’t get through. So it's a good idea to join the discussion group so that you don't miss anything.
The group is a standard Google Group; most questions you may have about how it works are answered here. There are archives going back to when it was created in early 2018 (if you get a page not found error, it is because you are not logged in with the email account you used to subscribe to the group). Before 2018, there was a Yahoo group with earlier messages.