I've removed the calendar. Basically, I didn't feel like trying to keep up on everyone's shows and only a handful of people were updating their own shows.
In theory, this is still a good idea. In practice, not so much.
That said, I have created a whole new site to accomplish this same thing. Feel free to look at it. http://comicscalendar.com/ You'll notice there is no content there. Which, again, is the main problem.
If you can figure out a way to make this work and get people to update their shows, please do that.