There will be a shuttle, not running all night. Uber is your BFF. It is not far from the venue. Note: Ubers in Northville take a long time to come. I would say 45 mins to 30 mins to call before.
If your invite says "and guest" you can bring a date :)
Yes! Valet will be there too.
The ceremony is outside in a heated tent. Dress warm if you get cold.