Be respectful
Despite the many ways to celebrate, this is a religious festival, so pay heed to ritual and ceremony. Be sensitive to picture taking; it’s always a good idea to ask permission first.
Choose your city to match your celebratory style
It should be no surprise that in a country as vast as India, forms of celebration vary, even for the same holiday. Do some research to learn more about how Navratri is celebrated in the location to which you're headed.
Participate
For the full experience, learn to dance the Garbha or Dandiya Raas, or try your hand at building a Batukamma to float down the river.