I heard Sai Baba appeared in disguise at someone's feast. Can you tell me what happened with Dev's Udyapan ceremony?

Yes, Sai Baba attended Dev's Udyapan ceremony in a miraculous way. As detailed in Chapter 40, Dev had invited Baba, who promised to come with two others. On the day of the feast, a Sanyasi appeared. Dev, not recognizing him, simply thought of him as a guest. This Sanyasi later returned exactly at noon with two companions, and all three were served a satisfying meal. Dev remained unaware that this was Baba fulfilling his promise. Baba later confirmed to Jog that he had indeed come in the guise of the Sanyasi, stating, "I said I would come with two others, and I went with two others." This illustrates how Baba could be physically present in one place while appearing in another to keep his word to a devotee.