A disclosed three-dimensional advent calendar defines multiple predefined advent spaces thereon demarcating an advent. The 3d calendar includes multiple decorated advent objects designed complementary to multiple predefined advent spaces. The 3d calendar also includes an adherent on a back side of the decorated advent objects, the adherent configured to temporarily keep the decorated advent objects proximal a predefined advent space. The adherent includes magnets, hook and loop material and sticky substances. For instance, the 3d calendar includes a Christmas tree, a Disney® Castle, a school graduation diploma, a bag of golf clubs and a baby crib. Exemplary decorated advent objects include Christmas tree ornaments, Mickey Mouse® head shaped objects, school objects, golf clubs, and pacifiers. Similar life milestones and business 3d calendars and matching advent objects are also included. An advent demarcating method via the 3d calendar and decorated advent objects is further included in the disclosure.