Main Event Games at local convention.
Make sure that your games are leading to a "MAIN EVENT" that can be only finished by gathering all the Players and Game Masters in one place to have an epic game. The local Convention is a great place for this. Here wars can happen, scores can be settled new alliances and new rivalries can be formed. IF the characters are from different countries then have them be manipulated by powerful NPCs. Set up trade routes and such as well. Introduce a common enemies or monstrous threats.
In Game calendar rules.
Set up a calender so that that one player with no life cannot dominate the entire game by playing in every scenario. Have holidays, seasons, weather events between games.
Message Board or Facebook PageThe Message Board and Facebook Pages can be uses for In Game and Out of Game communication. Use it and use it well.
Zine made to PDF and Print. Make sure and mention any player that plays by character name!
Catalog and make into history the tales of your game world so that years form now it may not be forgotten. Even one may rekindle the old game and or be playing the children of the original players.