My friend, the recent bomb blast that happened in India, was at the Mecca Masjid in Hyderabad. It is not only at places that you mentioned.
When did a bomb blast stike India during Diwal or such festivals? Give us some facts please.
Why there are Hindus and Sikhs dying in Kashmir, well this is a totally political issue between 2 countries that just doesnt want to solve it even if they wanted it to. It is an issue that can always win you elections. It is the proverbial golden goose. They wouldnt want to kill it.