NO! JK if your invitation says "and guest" then we would love for you to bring your special someone but if not we prefer it be just you.
Well that is a great question, we would love if you could carpool because we do have limited parking since the reception is in a neighborhood, but you can just park in the street near the house.
Semi-Formal Attire is perfect. Something dressy enough for the church but comfortable to be in the backyard for the reception.