If you are staying at a hotel downtown, you may have parking included, in which case everything is very walkable. Bring comfy walking shoes! If you are staying a little further out of downtown then there are a number of parking garages available, including one directly behind the church and a few blocks from the reception venue (College Street Parking Deck). Lyft and Uber are more convenient options than trying to find a taxi if you will not be driving and parking in town yourself.
The church has a side lot with very minimal parking for handicapable guests or those needing a little assistance. You can also get dropped off at the front steps of the church while a member of your party parks the car in the nearby garage. The reception venue does not have any parking, so plan to park at your hotel/parking garage and stroll on over to the party.
We intentionally planned to have the ceremony and the reception within walking distance of each other. The church is half a mile from the venue, a leisurely 10 minute walk if you take the "long" way. It is even less if you take a few side streets and cut through the parking lot of the Renaissance hotel!