Navratri is a festival dedicated to the worship of the Hindu deity Durga. The word Navaratri literally means nine nights in Sanskrit. During these nine nights and ten days, nine forms of Shakti/Devi are worshiped. The festival is being held in Bangkok at the moment at various Indian temples around Bangkok. Although Little India is in the Pahurat area, to the west of Chinatown, the main Hindu temple is Sri Maha Marianman Temple (Wat Khaek) on Silom Road. It is here where the big parade will take place on the last day which is Tuesday 11 October 2016 from 7:30 p.m.
I have marked the parade route on the map above. It is best to come early as Silom Road inbound, Narithawat Road, Sathorn North Road and Surasak Road will be closed from about 5pm. The best way to go would be by skytrain as BTS Chong Nonsi is on the parade route.