Food has been central to Salem’s identity for centuries, from its pre-colonial name, Naumkeag, meaning “fishing place,” to the 18th-century spice trade that helped make the city a wealthy international trading port. So it’s only fitting that food will be an integral part of Salem’s 400th anniversary celebrations this summer with “Food at 400+” a 12-day festival presented by Salem Food Tours that celebrates Salem’s culinary past, present, and future.