Above is a link to the official Secession steam group. It's been inactive lately, but I spent some time yesterday overhauling it and replacing the inactive officers.
If you join this steam group, you will get notifications for linebattles, new versions, and possibly times where a public play server is decently populated. You should also invite friends who play Secession but don't know about the group.
This should hopefully help us coordinate better as a community.