The way I see it, you shouldn't tell me something is okay, if it is indeed not okay with you. If I ask you if you mind something happening when I am out of town, tell me you don't want to deal with it. Don't wait until I get a call back telling me what day the event will happen to tell me you wish I had arranged it for a day when I am in town. That was the whole point of discussing it with you in advance.