While walking the streets of Old Delhi, we encountered this unexpected parade. A group of people playing instruments, carrying a few floats, and seeming to have a good time.
Our guide told us that it was a parade of Jains -- people adherent to the ancient Indian religion of Jainism. I don't know much about the faith except that along with Hinduism and Buddhism, it is one of the oldest religions in Asia, dating to the 6th century.
There are many festivals in the Jain faith and we thought it likely was a celebration of one of these. Unfortunately I'll never know.