This would work only if they could show they had another engagement to do or they decided to be on vacation that day....I am sure they would be dragged into court and have to prove why they couldn’t do the event...but then the couple could just pick another date, etc....
I'm glad I'm not in a business where I have to deal with this crap. I feel bad for those who do, like this Christian photography studio.
As someone said upthread, I really wonder if this district judge would force a Muslim to photograph a Jewish wedding?