Can you describe the specific event that marked the beginning of the mosque's transformation?

The text points to a specific event around the year 1912 as the start of a new phase for the mosque where Baba lived. Prior to this, the dwelling was in a rustic state, with the ground having "knee-deep holes." The transformation began with a remarkable act of devotion. As detailed in Chapter 5, devotees came together and, in the span of a single night, paved the entire floor of the mosque with stones. This act of service, which rectified the uneven and difficult ground, is highlighted as "the real beginning of the transformation of the mosque," turning it from a dilapidated structure into a more fitting abode for Sai Baba and the growing number of devotees who gathered around him.