I don't think you're not off base at all. If you accept it without protest, you're cooperating with your husband's attempts to isolate you -- to put you off to one side -- while he immerses himself in a single lifestyle. Now...if he's planning it as a "guys only" party of some kind, and if he’s excluding all the wives/girlfriends of the other men invited, then I could see it. (I don't know how something like that would go -- it couldn't be a "bachelor party" kind of thing for it to be acceptable, but perhaps we need more information?)

How To Organize A Marital Recovery Plan
Spying 101
Exposure 101"