When I lived in Mauritius Island (which has a large Indian community) we used to celebrate Diwali. Now, I like to bring that celebration into our family life each Fall with very simple lights and a few crafts.
Diwali is a festival that takes place on the 13th day of the month of Ashwin in the Hindu calendar, which makes it somewhere in October or November depending on the year. This year, Diwali will start November 13th and last five days.

Although there are a few different beliefs in India about the origins of the festival, most people believe the lights invite the Goddess of Fortune and Wealth (Lakshmi Pooja). It is an opportunity for a clean slate, houses are cleaned and scrubbed, accounts are settled, forgiven, or simply reviewed, and new clothes and things are bought and worn.
The main decoration is a lot of lights, but you can see a lot of tiny oil clay lamps (diwas) all over inside and out of houses. Fireworks, firecrackers, flowers, and sweets are shared by the family. Rangolis (floor decorations made of rice and sand) are a nice craft to try with the kids.
A few good resources:
• National Geographic has an interesting kids focused article.
• Activity Village has a nice article along with printable coloring pages, and instruction for making different crafts.
• KidsGen has a very nicely made site full of resources such as the history, recipes, decoration ideas, crafts and so much more.
• The Huffington Post has an interesting article about Diwali being more and more celebrated in the American culture.
• Pinterest user Prismmahas compiled a board on Diwali decoration ideas.
(Images: 1. Flickr user Partha Sarathi Sahana 2. Flickr user Rameshng, both licensed for use under Creative Commons)

Commercial Flour Sa...
Happy Diwali to all readers.A minor correction--the festival of Diwali is only two day long. The main event is on 13th, that is today. Yesterday, the 12th, we celebrated a minor version of Diwali. So, the actual Diwali was yesterday and today (12th and 13th). Depending on the part of the India one comes from, there are different kind of religious things done two days prior to the main Diwali. Once again, I am thankful to the writer for making readers aware of one of the main festivals of my country.
Sounds lovely! I'm rooting for an all-purpose international "Festival of Lights" unaffiliated with specific religions but adopting some of the traditions form many of them, and celebrated sometime in late November through early December. I'd gladly give up the ones I celebrate now to simplify the calendar! ;^)