The document summarizes the Church's liturgical calendar, including the seasons of Advent, Christmas, Lent, Easter, and Pentecost. Each season has its own colors and celebrations that mark the unfolding of Jesus' life and ministry throughout the year. Key events like Christmas, Palm Sunday, Holy Week, Easter Vigil, and Pentecost are explained in one to three sentences. The calendar also lists important saints' feast days that are observed annually.