Christine C./YelpSo big already?Anyone who follows the restaurant business in this town knows that thriving for two years (hell, even surviving) is no small feat, especially for a fine-dining establishment. To celebrate its second birthday, New American spot Spruce (3640 Sacramento at Spruce) is throwing a special dinner this Sunday. Chef Mark Sullivan's Celebration Menu rings true to the Spruce mantra of local, local, local. Its three courses focus on local farmers and their products, wi