Yes, there will be a meal during the reception.
You do not have to street park, there are two parking lots the main parking lot we advise using is accessible from Lincoln.
IF you are at the Harn Homestead then yes, there is a sign on N Lincoln BLVD pointing to the museum's parking lot. There is a short walk from the entrance to the ceremony area, just follow the marked Path and you will see the chairs. The ceremony will (weather permitting) be outside.