This sounds like a great idea. At the Urban Hennery, they've issued a "Dark Days Challenge" to eat locally. From November 15 to March 15:
Cook one meal a week featuring at least 90% local ingredients
You define local - the standard definitions range from 100, to 150 to 200 miles
Ingredients can be things you grew and preserved yourself, sourced from local farms and markets, or purchased at the store
Write about the meals you cook, your challenges finding ingredients, why you’re eating local or whatever else strikes your fancy for each recap. Photos are optional.
Include friends and family in your sourcing and eating as possible
More info and sign up at the Urban Hennery