There really is no good solid advice on how to get out of meetings that a spouse expects you to go to and avoid fights.
A heart-to-heart talk with the wife might help.
Some try a trade-off- "I go to one meeting and you ....
.....give me one oral sex"
.....go to one nightclub/sports event/meeting of something else."
.....give me no grief about one day of golfing or fishing."
Some spouses will tire of the tradeoff after awhile and just say "forget it."
Many will never agree to tradeoffs and heart-to-hearts won't work. Then it's argument-city or sit at the KH.