Go to the frontpage of the blog, and then click on "see all upcoming events" on the right column. You end up at https://blog.torproject.org/events/upcoming which starts off telling me about a January 24, 2008 event. There is a subtle link called "See the events calendar" which brings us to https://blog.torproject.org/events/month which I think is the calendar we are hoping to see after the first click.