Clearly it is too late for the observation of my preference that my husband would remember our anniversary and refrain from scheduling a training session on it in the first place. It seems that it is evidently out of the question for you to reschedule your training session, though I don't see how it is disloyal to do it a day earlier or a day later or even simply earlier in the afternoon.
In light of that, Friday will suffice. Sacrifices, as you say, must be made.
And it is not my anniversary. It is ours, Patrice. It is supposed to be a celebration of our marriage. I realize that you have many obligations and commitments and that what you do is very, very important. Perhaps it is selfish of me to make such demands, and perhaps I am speaking too freely, but I think that our marriage is important as well.