If your family know how you are, I would hope they would intervene for you at least occasionally to get a needed break. Unfortunately if you are the person that generally get things done like cooking and making sure everyone else is comfortable, then you may have to grin and bear it. I am not sure of the dynamics of the visitors (your relatives, his relatives, mutual friends, etc). If they are his, then you probably may get more time than you know since hubby should bear the brunt of most of the socializing. If yours, then hopefully they know you as well. But that is not always the case especially if they do not understand the need for you to have your own space.
On another note as it pertains to type, you have probably been through this scenario more times than you can count as well, so you may want to ask what is driving the anxiety. Well that's easy, it's your tertiary function Ni that is considering how this future event will unfold. The problem is that it can't always be trusted, at least mine can't and many times it just fills me with unnecessary anxiety. Currently that pesky tertiary is being allowed to run rampant creating anxiety, but at some point our trusted Se will awaken to cease the moment and allow you to actually enjoy yourself. Welcome to the forum.