Okay - much to address...
mgrasso, got your Unearthed Arcana game signed up. I wouldn't worry about attendance too much. Through walk-ins and last minute sign-ups, we've managed a decent crowd each time. I think many people have gotten into the habit of waiting to sign up for games since we have been enforcing the "no game hopping" rule. I know that I have been a bad example by not particiapting in the morning slot yet...
As for RPG.net and the Gameday - I am not running Gamedays for RPG.net for a number of reasons (mostly attendance and support). Mark asked me to take over the ENWorld Gamedays, so it seems kind of tacky for me to be overtly pushing the ENWorld Gameday out at RPG.net. The fact that I run Synnibarr at the Gamedays has gotten some press over there, but not enough to draw people in.
I don't think the Chicago Gameday would (or should) ever be a sticky here on ENWorld - it isn't an "official" event like the ones I ran for RPG.net and ENWorld would fairly have to make every gathering a "sticky". Clutters up the forums and, as Joshua pointed out, stickies tend to get ignored.
Like Mark pointed out, there are a number of ways to drum up interest outside of just the ENWorld boards. Unfortunately, my change to a job that would allow me to use the Internet during the day is taking longer than I had hoped, so I can't be as vocal as I'd like. As I menioned above, though, we always seem to get a good crowd.
Thanks,
Matt