Based on the text, when did the formal Chavadi celebrations start, and what was Sai Baba's routine for sleeping arrangements?

The source material provides specific details about Sai Baba's routine and the commencement of the Chavadi celebrations. According to Chapter 37, Baba followed a strict rule of alternating his sleeping location every other day. He would spend one night in the Masjid and the very next night at the Chavadi. This sequence was followed continuously until his Mahasamadhi. The text specifies that the formal worship, bhajan, and adoration of Sai that characterized the grand Chavadi celebration began on December 10, 1910.