It is a balmy Friday morning in June. You feel a bit giddy because your assistant scheduled the last procedure for 2 p.m. Your kids left for summer camp last week, and you have a great early dinner with friends planned. It’s rained a little during the week, but the weekend forecast is glorious. Nothing is going to ruin your warm, relaxing spring weekend. Nothing, until your junior partner — only years out of his fellowship — knocks on your office door and gives notice. Can he do that? There goes the weekend.