we just released broadcasts, which lets room owners send out messages to people who have subscribed to rooms.
so if you’re running a room, just click the "broadcast" link at the top of the interface
then you’ll be prompted to send a message out to people who have subscribed to receive broadcasts from your room.
it is a good way to help gather people around a specific event. also, you can sign up just to receive broadcasts from a room, instead of being notified via IM or email every time people enter the room.