Valet parking is provided. Pull up to the front of the venue (gravel circle drive immediately off the main road), and someone will assist you.
See "Travel and Accommodations" page for info on taking a shuttle bus! Link (copy and paste into your web browser) to sign up for the bus here: https://forms.gle/LW4jyvvqejfgrb3HA
Your guess is as good as ours! Weather in Maine can be unpredictable at any time of year (well, except winter), and September could easily be in the 80s or in the 50s... or in the 80s at noon, and in the 50s at night. Be sure to check the weather leading up to the day of, and bring layers!
No.