@Virginia69 Yeah, you would think he would have known in advance if he was getting married or attending someone else's wedding.
In any case, when you review this person, if you don't think he is a good candidate for Instant Bookings, give him a "thumbs down" in your review and write a private comment to Airbnb why you don't think this person should be able to Instant Book.
If that doesn't prevent him from making an Instant Book again, you can cancel up to 3 times by stating you are not comfortable with this guest as described here:
https://www.airbnb.com/help/article/990/i-m-a-host--what-penalties-apply-if-i-need-to-cancel-a-reser...
By the way, what's up with all the reviews from Laura? Doesn't look right.