Just to throw an idea out there, how about hosting some form of community competition? As opposed to the forum-specific events (such as Javyar's, etc) this event would be heard by the entire community. An art contest, per se, or a story, that might fit in with the topic of the upcoming podcast, could be a possibility.
So, for example, if the next podcast was about The Old Republic, the competition might be to create a drawing on that subject, or write a short story. In essence, I suppose that it's like the jingle thread (in the sense that it's a bunch of people competing to earn recognition, or have something shown/read on the podcast).
Just my two cents.