Unfortunately, if your invite doesn't have 'and guest' then we haven't accounted for anyone else to join you.
Most GPSs will bring you right to the road you're suppose to be on but might not lead you to the correct driveway so please allow time to make a few turns or to call someone so you aren't coming down the drive as the ceremony has started. There should be a sign by then!
The internet told me if I wanted my guests to be comfortable but to not feel underdressed then to put Dressy Casual.