Agreed. My schedule is exactly the same as yours (ceremony at 5:30, cocktail hour at 6, reception at 7) and I didn't indicate AM or PM on my invitation. I didn't feel it was necessary, and I had a professional stationer helping me with the wording of my invitations, so I trust her judgment.
Clear liquids, including water, clear tea, black coffee, carbonated beverages and fruit juice without pulp, up to two hours before surgery. Very light meals, like toast and tea with milk, up to six hours before surgery. Heavy meals, including fried or fatty foods and meat, up to eight hours before surgery.
Avoid extremely hot foods. Do not use a straw for the first few days after surgery. It is sometimes advisable, but not absolutely required, to confine the first days intake to liquids or pureed foods (soups, puddings, yogurt, milk shakes, etc.) Avoid chewing food until tongue sensation has returned.