So, Eid al-Adha (The Great Holiday) is coming up in a few weeks. This holiday commemorates the sacrifice of Ishmael by Abraham, and comes at the end of the Hajj. You have to be in Mecca and Medina to participate in the Hajj, but Muslims all around the world celebrate Eid al-Adha.
The main observance of this holiday is the sacrifice of a sheep. Most families will sacrifice a sheep, then share the meat with the poor. This is probably not something you would care to do as a family. :)
Instead, you could help others in a different way. Donate money to the tsunami victims, many of whom are Muslim. Serve dinner at a homeless shelter. Visit a retirement home. There are lots of things to do.
Food is a huge part of any Muslim holiday, and since I have so many Middle Eastern recipes, I'll add those tomorrow. A real Middle Eastern feast with lots of friends invited is a great way to celebrate.
I don't have any projects specifically for Eid al-Adha, but I do have general Muslim games and projects that I'll track down soon.