We would like to get married on the beach, we will have approximately 80-100 guests.....the location will only allow at most 50 chairs to be set up.....the ceremony is only going to be about 15-20 minutes.....is it realistic to have everyone stand (knowing that many will arrive earlier than the ceremony and will likely be standing for a good 15-30 minutes prior to the ceremony or should we have some seating and everyone else standing? HELP!!!