Ceremony on Steps?

So, a couple is getting married on the riverbank at a new marina recently built at our city. The reception will be held in a building above where they want to get married. The reception building is elevated and the ground is level beneath it, where we considered having the ceremony. But, the sun doesn't shine there and has a dark/damp feeling. So, we are considering having the ceremony on the steps beneath the reception building leading to the water. But, I have no idea how to setup the ceremony where there are steps, where the people would sit. I mean the steps are wide enough…I would say each step is 4 feet long, and a little more than a foot high… Rolled Carpet? White Folding Chairs?

Typically, chairs on steps not a good idea unless it's seated like a movie stadium seating where it is going up, not down and they would have to be very wide steps in order to have chairs and still have plenty of room for people to walk by, like a big spacious movie theater where you can walk by the other people without them having to flinch. Otherwise it's too dangerous to have chairs on the stairs. I also need to talk to the reception hall as they would be the ones to set this up for us and may or may not even allow it.