Abstract: A calendar comprises a multiplicity of base sheets, each of which bears visual indicia of a plurality of day dates in a matrix of date sections. Each day date indicia occupies only a day date image portion of each date section, thus leaving a portion of each date section blank. The day date image portions of all date sections of all sheets correspond in size and position. The calendar further comprises an overlay sheet bearing graphic material in a matrix of image sections that correspond to and register with the date sections of the base sheets. Each graphic image appears only in an image portion of each image section. Each image section of the overlay sheet has a window that corresponds to and registers with the day date image portion of the date sections of each base sheet so that the day date indicia are fully visible through the windows of the overlay sheet.