I knew of a guy who had a very severe stutter but his fiancé just had to have a big African wedding with like 2000 people. TBH I dont think it was just the fiancé, his family also wanted a super big wedding. and africans generally obey their parents so there was no chance of just eloping. Anyway his best friend and best man (my very good friend) read a book that said choral speaking could help. So they practiced the vows together and when the day came, best man was standing right behind him and spoke in choral with him the whole time. It was so nice and he was so calm because he knew he had back up if he got stuck. Get a good best man.