A 27''.times.28''.times.1/2'' calendar/organizer that combines a large, 12-page, printed paper calendar with a 1/4''-1/2'' thick and "pin-receiving" backboard. The front sheets are printed with a calendar array of days and weeks, with each day having a height of at least four inches, such as days which are 41/2 inches tall by 4 inches wide. The front sheets are attached to the backing board at their upper ends by two heavy duty staples, and have three mounting holes punched in aligned locations between the staples. The backing board is provided by double layer cardboard with each layer thicker than the plurality of front sheets, so the backing board can receive and hold a tack or push pin without regard to whether the tack or push pin extends through none, one or all of the front sheets. The backing board may extend longer than the front sheet calendar pages, so as to facilitate an additional "pinning surface" for items not associated with any particular day of the month.