Making a calendar in Adobe Indesign is a fairly easy process if you employ a template, or use one of the many scripts out there that gives you a foundation on which to build on. That said, many of these scripts either leave you with tweaking to do or they take the fun away from designing the calendar. So I've put together a boilerplate for calendar design in Adobe Indesign which you can download, tweak or modify very easily.
You can download the template I created below, all I ask for is a tweet. I've stripped it of content but left the styling I used. This can all be editted very quickly using the object and paragraph stylesheets which I've labelled. At some point, I'll write a script to generate the dates but till then, Enjoy !