I have a similar problem with my mother in the sense of her not really liking my boyfriend which makes most social occasions weird and awkward at times.. At the end of the day you can make 2 choices comply to her wants and be a doormat (I assume that is not an option as it wasn't for me). Or just keep living your life with this guy, in the end I am sure she won't want to sacrifice a relationship with you in the future and want to miss your wedding or seeing her grandchildren. (That is my hope for myself anyway)
“So it's not gonna be easy, It's going to be really hard, we're gonna have to work at this everyday, but I want to do that because I want you. I want all of you, forever, everyday. You and me... everyday.” <3