Delhi has its own charm. Even though living in this city is full of struggle, polluted air, rapidly decreasing space, traffic etc, still a common human being like me can find ample amount of happiness in various cultures and festivals celebrated all across the city.
Durga puja or Navratri is a major festival celebrated all across India. However, I find Bengali way of celebrating this festival more intriguing. And if you really want to get the feel of Kolkata type Durga Puja, then Chittaranjan Park or CR Park should be a top priority in your list.