It is a church service that is deeply symbolic and beautiful. Copy the link below to view some websites that explains the ceremony. https://ephemiamaria.com/2025/02/20/greek-orthodox-wedding-ceremony/ https://www.greekorthodoxchurchtampa.com/church_files/Wedding.pdf
The ceremony starts at 3:00pm. It is best to get there 30 minutes early, since there is no assigned seating.
In the Orthodox church it is the practice that everyone stands for all services. There will be some seating provided at the back of the church and at the sides. There are chairs in the church book shop. The book shop has a window that looks into the nave and allows you to see the service.