The NPR 2020 manual contains the same list of festivals which were used in the 2011 manual.
According to the document shared by the Citizens for Justice and Peace (CJP), the National Population Register (NPR) 2020 manual excluded Muslim festivals (refer page 32). However, the 2011 NPR manual published on the Census India website also excluded Muslim festivals.
According to a Home Ministry official, festivals listed in the manual aid the NPR enumerators to help several people remember their month of birth by citing the English or Gregorian calendar and these significant Indian festivals. The page related to the festivals is supposed to be read along with the pages of the manual dealing with the date of the birth-related question.