Countdown calendar

A theme calendar having a front and comprising substrate support means, date locations on said substrate support means corresponding with time periods of a countdown time interval, a plurality of separately mountable marker elements, each marker element being removably mounted to said substrate support means at said date location, a pictorial design carried on said substrate means, said pictorial design including a plurality of separate target locations, each having a distinguishing designation for removably mounting an associated one of said marker elements having a corresponding designation, said marker elements being movable from said date locations and mountable to said associated target locations in accordance with the expiration of said time periods, each of said marker elements including design features that are visible from the front of said theme calendar when said marker element is mounted to said substrate support means at said associated target location, movement of said marker elements from said date locations to said associated target locations revealing a first text message at said date locations and completing or modifying said pictorial design or forming a second text message at said target locations with said marker elements mounted in said associated separate target locations.