you should know better, given the nature of your request, to post such a question under an alias. your post reeks of le, planning a stakeout on april 7, 2024.

the mayan apocalpyse kinda moots the whole point anyways.

t/c

....... You should book for both time periods, and in order to hold that place in line, give her a 50% deposit now on a locked in rate. Ask her to apply compound interest to the deposit, so the future value of that money will be closer to total due for the appointment. If she wants a provision for the future value of her services, make sure it is not based on Libor, or you'll get screwed twice at the culmination of the appointment.

Either that, or book someone else for tomorrow. Be careful of the sun, wear protection, and it should be ok. Also, make sure you are freshly bathed. A swim in Quincy Bay should suffice.