Intruding Parents who make plans to "show up unannounced"?

its in your byfriend hands, he don't seem to be able to stop them or is unwilling to stop them from saying things bad about you and he shouldn't listen to it i would go as normal if the show he needs to tell them if thats what they are here for they can leave he needs to make known he will not tolerate disrespect of you in any way. You should talk to him about this and find a way to say it to them that will not cause a war, they might be upset but they'll get over it and if they want him in thier life than they need to relize he's a man not a child and respect him as such, after all you are his choice