What was Sai Baba's routine regarding the Chavadi, and when did the formal celebrations there begin?

According to the narrative in Chapter 37, Sai Baba had a consistent routine of sleeping at the Chavadi every other day. He would alternate, spending one night in the Masjid and the next at the Chavadi, a practice that continued until His Samadhi. The text specifies that the more formal worship, bhajan, and adoration ceremonies at the Chavadi officially commenced on December 10, 1910. Before the procession on these nights, a bhajan group would come to the Masjid and sing until midnight.