Holi : Colours :: Diwali : ? Complete the analogy.

The relation is a festival : the thing with which that festival is chiefly kept. Holi is played with colours thrown and smeared about; Diwali is kept by setting rows of little lamps along walls and windows, which is what gives it its name as the festival of lights. Each distractor belongs to a different festival, and that is what makes them plausible — kites are flown at Makar Sankranti, the bonfire is lit at Lohri and the rakhi thread is tied at Raksha Bandhan.