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.
Knowing all of these facts can help you determine how many calories there are in an orange. 1  A small orange that weighs about 96 grams and is 2 to 3 inches in diameter will have 45 calories. 2  A medium orange that weighs about 131 grams and is 2 to 5 inches in diameter will have 62 calories.