For an Orthodox wedding it is custom to stand. There is a bench along the wall, please save those seats for the elderly or differently abled people that can’t stand.
Park along the streets surrounding the church. Make sure to lock your doors and don’t keep anything worth value in plain sight. It’s Denver.
Wear something you would comfortably wear to church. In Orthodoxy, it is common for women to wear scarves on their heads. This is not a requirement, just an explanation incase you see it and are curious.