Happy Day Corporation Share: Dining Happy Day Corporation Visit Website 703 Main Street Lewiston, ID 83501 (208) 743-0583 ext 204 (208) 746-2041 (fax) http://www.happydaycorp.com About About Corporate home for Arby's, A & W, Taco Time, Tomato Bros., Main Street Grill, Zany's Hollywood Grill, Southway Pizzeria and Happy Day Catering.