The document discusses several festivals and celebrations that take place in Vilnius Cathedral and the Old Town. It describes the annual Casimir Fair in March, where streets are filled with folk artists and craftsmen from Lithuania and neighboring countries. It attracts hundreds of thousands of visitors and includes a procession of artisans. The document also mentions Palm Sunday, celebrated the week before Easter, where a procession circles the church with palm branches to commemorate Christ's arrival in Jerusalem. Finally, it provides details on St. Casimir Chapel, one of the most valuable Baroque masterpieces in Lithuania located within Vilnius Cathedral.