Hahahahahahahahhahhaahhahaahahahaaaaa

gadzooks!...Maemish.
Now THAT was fabulous.
Please do take a picture...
It would serve as a reminder to the rest of us guys...

And really ...
it isn't that us males don't love madly and deeply our ladies...
it is just that we see the method and priorities for expressing it ...differently from women.

Is it so important for you to be right on top of dates when they come now and again...
or whether it is more important for you to be right on top of doing your best by her every single day of your life...

Maemish...
Been here a couple times...
Hell ...I have been in far more delicate and complex situations and know how to fix them so they never happened.
So I know exactly what you need to do to make the problem...not even be a problem at all.

Time it.
MAKE SURE the phone rings for her from the weekend spa - getaway for you both ...doing their requisite "courtesy call" to remind and confirm your room.
MAKE SURE the receptionist is completely aware of the situation and is willing to fib on your behalf saying you reserved this weekend months in advance.
That way your bases are covered.

I suggest finding a quiet place to call and book it as soon as possible.

Then when she gets off the phone ...
Just say..."Sorry darling, I couldn't say anything for fear of spoiling the surprise, I couldn't book it any sooner for our anniversary.."

It works, erases all grief immediately, and is worth every penny for that.
(not to mention the get-away-weekend-spa sex is always a perk for the marriage )