If your invitation says "and Guest" then yes, if not, we prefer if it was just you.
Semi-Formal.
Yes! There is adequate parking at the venue, and the ceremony space and reception space are within walking distance from each other.
All wedding guests need to stop at one of the park entrance gates and tell the attendant you are there for the Villanyi/Edmiston wedding and you need a Special Event Day Pass, this will get you in for free for the day!
Yes and no! The ceremony is outside. The reception is inside and just a short walk from the ceremony site.