Celebration, the grandmother of hippie home-cooking restaurants, has been overwhelmingly popular since its opening. In fact, the only drawback to dining there is the bankable line and the no-reservation policy. The good news is that now you can enjoy home-cooking at home. Celebration has started delivering dinner: pot roast, baked chicken, meat loaf, vegetables, breads--the whole menu. Orders must be at least $10, and the free delivery is restricted to an area between Cedar Springs and NorthPark.