1) Start a Prototype Retro Game Club. Each month pick a classic game to feature. Give some background history on it and give some strategies. Have all of the hosts play said game and share their experiences. Encourage listeners to play the game as well and call in and share their thoughts on the game.
This. Have a running thread in the forums to go along with it. Announce the game one podcast then have someone in charge of running the thread, guiding the conversation, etc. Like Together Retro on Racketboy or Game Club on RebelFM. Have set checkpoints for certain times and everyone can play up to that point then bullshit about it.