Formal attire - formal suits for men and dresses that go below the knees or formal cocktail dresses for women. Still stuck? This guide explains it well! https://www.theknot.com/content/wedding-guest-attire-cheat-sheet#formal-attire-
There is a parking lot with ample parking under the ramp outside the Basilica of Saint Mary. The Lafayette Club will have valet parking for your convenience. Otherwise, uber and lyft are both great options!