This document summarizes important Marian feasts and devotions in the Catholic liturgical calendar. It describes the different classifications of celebrations (solemnities, feasts, memorials) and provides details about specific Marian solemnities, feasts, and memorials honored on different dates, including the Assumption, Queenship of Mary, Birth of Mary, Our Lady of Sorrows, Rosary, Immaculate Conception, and Our Lady of Guadalupe. The summaries of each commemoration include relevant biblical references, historical background, and theological or spiritual significance.