You'll also want people to RSVP so you have a head count for the caterer. If, on the other hand, your rehearsal dinner will be fairly low-key or small (think: a party at a restaurant or an intimate gathering at your future in-laws' home) then you don't need to be as official with your invitations.
The exact nutritional value of an orange depends on its variety. According to the U.S. Department of Agriculture, a standard-sized navel orange contains 69 calories, 17.6 grams of carbohydrates and 11.9 grams of sugar.
A typical tangerine yields about 35 calories, which is less than most oranges mainly due to the size difference. Calories are a measure of how much energy a food yields. Tangerines contain no fat and only a small amount of protein. They are, however, very good sources of vitamin C, folic acid and beta-carotene.