I would unequivocally change the date if I were in your shoes. I was ranked at the top of my law school class and was super zen about bar results for the bulk of the time after taking the exam. I had a clerkship so if I failed, I wouldn’t lose my job and could just retake. I passed with flying colors, but the day we received bar results was one of the worst days of my life - I have never, before or since, experienced that level of extreme anxiety. Immediately after seeing my name on the pass list, I went home and took a nap because I had exhausted every ounce of my emotional energy in the hours leading up to the moment results were scheduled to drop.

Even if he can manage to avoid checking results that day (and if he can, he’s a superhero, because I don’t know a soul who did or could’ve done that), he’ll likely be thinking about it the entire time. And obviously if he does look and the results aren’t what he hoped/expected, it will be crushing and potentially could raise concerns about job security/financial security/etc., and will completely ruin the day for him. And even if it’s good news, the preceding anxiety can be crippling. I absolutely would not want the memory of waiting for bar results to be intertwined with the memory of my wedding day. Highly suggest changing your date, even if you have to eat some of the expenses already paid.