Can you explain Damu Anna's role and vow related to the Ram Navami festival in Shirdi?

Damu Anna played a significant role in the annual Ram Navami festival in Shirdi. According to Chapter 25, he had a regular vow to provide one of the two large new flags that were taken out in a procession through the village. This vow was carried out with uninterrupted love and devotion for many years. The other flag was provided by the Nimonkars. The procession would start from the house of Kondaji Sutara, the carpenter, and proceed with musical instruments to the Masjid, where the long banners were tied to its two ends, marking a key event in the festival.