My DJ recently announced over Facebook that all his 2021 wedding will be required to wear masks or else he is refusing to play music. While I personally have no issue wearing a mask (even though its my wedding) I have guests who will be attending that simply won't. My question is since this is now required and not part of the original contract I signed, am I allowed to cancel without paying the remaining balance? I simply cannot control a large amount of guests on who wears a mask and my other vendors are not requiring it, rather it is based on comfort. This has greatly upset me as my wedding is in May of 2021 and who knows what that will like from then, but I cannot guarantee his demands will be met and I will be out thousands of dollars if he refuses to play based on my guests decision.