Locavore Wedding Catering

It's a trend! [If you've been out of the locavore loop - this means food produced and marketed within 100 miles of your abode.] See The 100 Miles Diet.
Some weddings are now 'locavorian', and some caterers advertise they can do this, especially in Canada. See the website Les Louises.

But you have to do some research, of course, and there are all sorts of websites and services IN PRODUCTION for local resources for organic food, but right now, it's completely dependent upon YOUR LOCALITY. Your organic food store will know the nearest suppliers of local food, of course. Try typing "Locavore" and your city in Google, and you'll find locavore clubs and contacts.

as in:
Locavore's Guide to New York City
Locavore.ca, Canadian blog.
La Vida Locatore - food and politics.
and
Organic Consumers Association - more food and politics

Here is a "local food wheel" for San Francisco, California. With debts to the Farmer's Alamanac of course.

Factoid: Hidden Meat items in Vegetarian Recipes