It is important ritual to take Ganga snanam on Deepavali. One must wake up at early dawn before sun rise, apply nalangu (turmeric mixed with quicklime) take oil bath with hot water.
One must wear new clothes that has been offered to Perumal, partake the sweets and savouries offered to Perumal.
Bursting of crackers is a part of tradition. Elders have followed this practise for many years. It is also in practise to light up a sparkler before the sanctum of Emperuman. So, one should follow all these to celebrate Deepavali traditionally.