Yes, open bar starting at 4pm until the reception is over (approximately 2-3AM). Make sure to bring cash to tip the bartender!
Yes, semi-formal. It will be warm-hot in September so dress accordingly!
YOU CAN CAMP AT THE VENUE SATURDAY NIGHT!! You must bring your tent and camping supplies but there will be an area for people who wish to camp there.
Parking will be surrounding the venue, it is first come first serve. However, there are many spots and will likely remain available throughout the evening.