Thanks for the quick response. I thought that was the answer, but it just seems wasteful for us to start eight separate blogs (and use up eight usernames) when all we want is one blog with eight members. Other than that, it seems to me that our only other option is to share the same username and password, and identify ourselves on each post. Am I right?
You are right.
As for usernames, you could arguably use one root name? conventgroupone conventgrouptwo etc then at least the namespace is’t likely to collide with later users.
And another of the blogs might be useful for something else within the group?