Cocktail Attire is preferred! Cocktail attire could also be called "semi-formal." No need to get a long dress or wear a tux. Short dresses or suit pants + a button-up shirt is great! Most importantly, dress comfortably. 10/10 recommend bringing comfy shoes for the dance floor!
There are multiple free parking garages within walking distance of the ceremony. Below is a link with a map to all parking options: http://visitdowntownplano.com/parking/