Darna Restaurant on Columbus will be serving during the holiday. Their food is Moroccan. For more possibilities, try posting on the Kosher board; they might have other specific suggestions. Some of the well known Kosher markets (ie, Supersol on the UWS) will be open during Chol Hamoed (the middle days of the holiday) or you could buy prepared foods from them in advance.
600 Columbus Ave, New York, NY 10024
661 Amsterdam Ave, New York, NY 10025