It’s very normal now to wear the Apple Vision Pro anywhere, weddings are no exception. In fact, they will probably thank you for all the spatial video you will be able to take so they can watch on their AR/VR devices in 30 years. Really they’ll have no idea that you have the game on in your field of vision at all.
I did this recently at my wife’s grandpa’s funeral and nobody asked any questions. Just a part of normal everyday life.