<Tr> <Th> Date </Th> <Td> Various </Td> </Tr> <Tr> <Th> Frequency </Th> <Td> Annual </Td> </Tr> <P> Heroes' Day or National Heroes' Day may refer to a number of commemorations of national heroes in different countries . It is often held on the birthday of a national hero or heroine, or the anniversary of their great deeds that made them heroes . </P> <P> National Heroes Day in Angola is a holiday in Angola on 17 September, the birthday of the national hero Agostinho Neto . </P>

What is the meaning of national heroes day