It sounds like you have a Joint Parenting Agreement/Final Custody Order. Those agreements typically have a clause about out of state vacations. You should review the agreement to find the exact language. It may be the case that one month's notice is required. In the event you violate the agreement, his recourse would likely be a rule to show cause. However, if he were to AGREE to the (get an email) that it is ok, then you should not have a problem. Almost all of those agreements have a clause to cover this type of situation. Hopefully, he will be reasonable.
This is not intended to be legal advice and no attorney client relationship exists by virtue of this answer. Your matter may be time sensitive and you may lose your right to purse the matter via the passage of time. It is always advisable to speak with a lawyer and discuss the merits of your claim or defense.
Review your agreement. Usually notice is needed for the yearly vacation time but not typically for short weekend trips out of town. He needs to know where you are but cannot really veto your trip.
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yes, you need to go to court to amend the agreement. this section means you cannot go to lake geneva for the day without thirty days prior notice. that is not usual.
but, we cannot tell you to go in violation of the agreement. but i doubt a judge would do much if anything about it if it does not take any of his parenting time.