#1- Your planner/site coordinator has a back up plan but being flexible is key. The back up plan includes not only moving any events that were outside to the inside but also securing a back up generator. Being flexible may mean getting ready earlier to get outside before the storm hits for photos.
#2- Your guests love you. No one blames you for this hurricane. Ideally your guests have common sense and if it is safe to attend, they will and they will bring umbrellas. Don't waste energy asking everyone if they are having fun, focus on enjoying the big day yourself!
#3- If there are food, drinks, people and lots of love then it will be a great wedding! If you have a large guest list coming in from out of town that can't make it, safety is always first. I've had a blast at a 20 person wedding. Don't focus on what is not happening or who is not there, focus on everyone who is there to celebrate with you!
And last but not least, there is this bride who had rain, hail and lost electricity for 3 hours of her reception but still had a great time at her wedding. I found a few cute photos of weddings in rain, if Irene lets up enough for some photo time outside, take advantage!