Each year, the United States Postal Service holds a food drive to collect donations for local food banks. The event is called Stamp Out Hunger and it's one of my favorite charity events because it's so easy to participate. All you have to do is leave a bag(s) of nonperishable grocery items next to your mailbox. (They ask that you not include items that are expired or in glass containers.)
This is an excellent time to go through your pantry and clear out the things you won't use before they expire!