After you've had your book token, and your grey socks, pretend you have a migraine but be very apologetic and self-deprocating, saying you don't wanna spoil the day but your head is really banging. Then, go upstairs, shut the bedroom door, and watch something you enjoy and/or have a blissful nap for 4 hours.
That's my plan anyway, should my mother be at my house for more than an hour tomorrow.