If you didn't do anything wrong, then I don't see any reason to validate or diffuse.
If it were me, and I'm not saying this to be provocative, I would've told my wife that if she hadn't had her head so far up the OM's @ss then it would've been a family outing and it wouldn't be an issue.
However, that's probably not DB, and I'm divorced now, so what I'd do might not be the best thing for you. But, it does make my blood boil when I read posts like yours. She's the one that's screwing around, yet she has the audacity to be PO'd at you for not telling her about the weekend plans? I'm having a hard time restraining myself.
