Mother's Day was on the second weekend last year so it wasn't an issue. For the past 3 years 1st, 3rd, 5th have been open in case he sends me a letter at the last minute saying who will be picking her up.
My issue with the second weekend is she's got a recital that is paid for, and it has not ever been a weekend that he has taken. Strictly the 1/3/5.
Ok, then I can understand your concern. You have always left the 1st, 3rd, and 5th weekends open in case he chose to exercise them, and there is something planned for the 2nd weekend in May.
He cannot argue with you about the 1st weekend because its Mother's Day weekend and that is clearly your holiday. He is being a bit of a jerk arguing with you about the 2nd weekend since there is already a recital planned and paid for.
Its up to you whether or not you want to stick to your guns about the 2nd weekend. The status quo is that dad has never attempted to exercise anything but the 1st, 3rd, and 5th weekends, Mother's Day weekend is your holiday and you have something planned and paid for, for the 2nd weekend.
You certainly cannot be held in contempt, you HAVE NOT waived the 90 days notice as other posters have implied, and dad still has the option to exercise the 3rd weekend.
That is the correct LEGAL answer to your question. Holidays consistantly interrupt regular weekend visitation in pretty much everyone's co-parenting schedules and legally holidays pre-empt regular weekend visitation.
A parent cannot be held in contempt for sticking to court orders. I have been a little suprised at how many responses to various posters today, seem to imply differently.