It’s generally a bad practice to include the name of exact server-side engine to domain name (“discourse” in this case):
domain name should not become irrelevant/pointless if site will, for example, switch to another engine or the original engine itself gets renamed.
So it’s probably better to use a more neutral and informative domain name like “forum”. It’s also easier to type btw.
As for the rest, congratulations, though I would prefer a dedicated engine programmed exactly for W3C purposes and seamlessly integrated with other functionality of W3C like bug-tracker, proposals tracker, public poll system, user profiles, etc. But, well, this is probably at least somewhat better than mailing lists.