On October 31st, after the death of Indra Gandhi, the riots instantly began. Her death is what triggered the hate against Sikhs. Only two Sikhs murdered her and yet now all Sikhs must be punished. It is similar to the way we look at Muslims today. A few extremists of the religion did some terrible things and now the whole religious group must pay for it.
The riots ended, for the most part, after her cremation on November 2nd. In smaller colonies the riots did not really end for several more days. Though the riots had ended, the discriminatory looks and acts did not. Wearing a turban was dangerous.