Boyfriend wants to propose to his girlfriend in my class

I was recently contacted by a guy (not a student here) who explained that his girlfriend is taking my class and he would like to propose to her. He asked if he could have a few minutes at the end of class to do so, on the last day of class before spring break.

Any thoughts on how to handle this? I've never heard of such a thing before and am at a loss as to whether this would be a good idea.