Can you describe the Ram Navami festival tradition involving Damu Anna's flag?

Certainly. According to the details provided in Chapter 25, during the annual Ram Navami festival in Shirdi, two large new flags are taken out in a grand procession. One of these flags belonged to the Nimonkars, and the second one was provided by Damu Anna as part of a regular vow he had undertaken for many years with uninterrupted love and devotion. The text specifies that this procession would commence from the house of Kondaji Sutara, the carpenter. Accompanied by the sound of musical instruments, the flags would be carried through the village before the long banners were ultimately tied to the two ends of the Masjid.