It's time to tell it like it is - you don't even have time to explain!  Anyone asking whether you can go to the late-night concert or early morning meanderings can just reference this sticker and understand that you've got some ducking stuff to do - and it's swimming.  If they're not enabling your swimming, they better be feeding you.  And if they're not feeding you, they better be letting you get every minute of sleep before swimming!  3x3 inch round water resistant sticker.