Make a sticky for "free boost lobby" posts. Just get in the thread and go for the last page to get information on the latest lobby available. This way the forum won't be spammed with countless threads a day and everyone will know where to go.

Rules suggestion:

Link: [Lobby leader steamcommunity link] or [Lobby link] (first one is better because lobby's bug out sometimes and have to be reformed)
Rank: [Rank requirements]
Need: [How many people you need]
Games: [How many games do you intend to go]