Well, for some strange reason (maybe because I've been in a volunteering mood lately), I decided to take over the organizer role, and just by actually making a little noise (IOW, sending out email to the membership saying that "yes, there will be a meeting" and "yes, I will be there, and this is how you find me"), I managed to get five people to show up. Unfortunately, none of us were fluent speakers, so instead of practicing, we were more or less reduced to talking about Japanese and how we learned it, etc. But, we did do some tentative organizational plans while we were there, and I have hopes that we may yet turn it into a healthy, active group. Which, of course, was all I ever wanted -- I wasn't really interested in running the group per se.
At any rate, if you're reading this, in Denver, and interested, I encourage you to join the group. I suspect approximately zero people here quite fulfill all three requirements (give or take one or two), but heck, there it is. The web page is http://japanese.meetup.com/70/, feel free to, ah, do whatever you do.