Is there a specific text recommended for performing Parayans to build a community around Shri Sai Baba's life, and who wrote it?

Yes, the text explicitly recommends a specific work for those wishing to study Shri Sai Baba. Chapter 0 identifies the 'sweet, inspirational, and grace-filled biography' titled Shri Sai Satcharita. This comprehensive work was written by the late devotee Shri Govind Raghunath, also known as Annasaheb Dabholkar. It is presented as one of the very few detailed works suitable for Parayans and Saptahs, making it an ideal text for a community of devotees to gather around and study to understand the life and teachings of Shri Sachidanand Samarth Sadguru Sai Baba Maharaj.