<Tr> <Td> Society (show) <Ul> <Li> Varna </Li> </Ul> <Ul> <Li> <Ul> <Li> Brahmin </Li> <Li> Kshatriya </Li> <Li> Vaishya </Li> <Li> Shudra </Li> </Ul> </Li> </Ul> <Ul> <Li> Dalit </Li> <Li> Jati </Li> </Ul> <Ul> <Li> Denominations </Li> <Li> Persecution </Li> <Li> Nationalism </Li> <Li> Hindutva </Li> </Ul> </Td> </Tr> <Ul> <Li> Varna </Li> </Ul> <Ul> <Li> <Ul> <Li> Brahmin </Li> <Li> Kshatriya </Li> <Li> Vaishya </Li> <Li> Shudra </Li> </Ul> </Li> </Ul> <Li> <Ul> <Li> Brahmin </Li> <Li> Kshatriya </Li> <Li> Vaishya </Li> <Li> Shudra </Li> </Ul> </Li>

When was onam declared as the national festival of kerala