Just to make it easy, when a PUG is being organised, why not make one of the admins make an announcement in the Steam Community Group. It would be more hassel free, and it would even remind you that its taking place, its easier to find out about it, and you get a notification of one being formed/in session. Where are the flaws? :D
http://steamcommunity.com/groups/Empires Is the official one. Prod one of the admins of the site to post an event. I try to whenever I remember. We had it open to everyone to post events, but some members could handle the responsibility.