Project Planning Card
It's not meant to replace your calendar. Instead, it's a flexible pad for plotting calendar constraints. If you know something needs to be done on November 15, this lets you work out where the lead times and advance dates fall. When do things need to go to the printer? When do deposit checks need to be cut?
Again, the planning grid is small. You don't want to be tempted to put too much detail here; you've got a calendar and a Tinderbox for that!