The Bullhorn may only show once you have been around the forums for a little while. But in the mean time, I will try to dig up a link. At the moment, there is not a lot of traffic on the Mudspike Discord server, other than the odd message and notice about a forum post.
If you are looking for multiplayer camaraderie, I recommend the folks on the Holle Point server and Discord. They are an active group of Mudspike members and I highly recommend checking them out.