I must have been busy with something at the time and then later forgot about the invitation. Can you PM me the details of how to join so I can take a look at the archives?

Yes you where on the original list people agreed to so there is I think no problem with you taking a look at the archives. I'll send you a PM.

Maybe you can try a different format? Make the forum public but encourage people to use fresh pseudonyms for privacy, and be ready to ban people who are disruptive?

Perhaps this would be a better approach. I don't think I have the time for this right now and not for at least a month or two, so if anyone else is feeling motivated...