We're looking at perhaps running an open source event this year and want to avoid overlap with other events that might attract a similar audience or that we want to attend ourselves. A calendar is possibly the single most unhelpful way to visualise dates, so I wanted something else.
If you turn a year into a clock face, you can just about fit a whole year into 360 degrees. And if you're not overly worried about the number of days in a month (and who would be, for a broad visualisation?) you can stick a months in each 30 degrees, for a total of 12.