Congratulations !
You have my best wishes on a life long healthy and fulfilling relationship.
I've seen some dogs at weddings, some right and some wrong.
I'd ask a trusted friend if they might hold Ellie (in harness and short leash) on the side, where she could watch. It's not good to have our animals walking around loose at times like that.
Be sure to tell you spouse ...
Love me, love my Dog !