If you are from South Carolina, or any costal town, you will know that the weather can change in a matter of minutes. In short, you never know what to really expect in regards to the weather. My advice would be to take the boy scout motto to heart, "always be prepared." Make sure you have an umbrella and have layers of clothes with you (for every season.. I'm only partially kidding). I'd say prier to packing keep up on what the weather looks like for that weekend. It could be hot that weekend, even though its November!
There will be plenty of parking at the venue for everyone. I would suggest to car-pool either way!
Not unless you would like to. The wedding ceremony and reception is all in one location; approximately five feet away from the other. :)