Can you recount the story of the group of devotees from Madras who visited Shirdi?

Certainly. Chapter 29 narrates that a group of devotees from the Madras region, now called Chennai, came for Sai Baba's darshan. These travelers were on a pilgrimage to Kashi and stopped in Shirdi along the way. They belonged to the Ramdasi sect and were known for their enthusiastic devotional singing. After taking darshan of Sai, they attained a sense of peace and stayed in Shirdi for several days, continuing their devotional performances. The chapter notes that Baba, in his characteristic way, gave them eight rupees and eight annas, which pleased their minds.