Can you tell me about the times Sai Baba made Lord Vitthal appear for his devotees?

Yes, Chapter 4 recounts instances where Sai Baba facilitated visions of Lord Vitthal for his devotees. In one story, Baba instructed Das Ganu to organize a Name-week (Saptah) and, placing a hand on his chest, firmly promised that "the form of Vitthal will appear" if the devotee is full of faith. It is said that at the end of the week, Das Ganu did receive a vision of Vitthal in Shirdi. In a separate incident, Kakasaheb Dixit had a vision of Vitthal during his morning meditation. When he later went for Baba's darshan, Baba knowingly asked him, "Vitthal Patil had come, right?" This divine play confirmed that Baba was the orchestrator of the experience, showing that for a true devotee, Vitthal would appear right there in Shirdi without needing to travel far.