For this year you may be able to present male for those ten days, but what happens next year? Hormones are going to change your body. I am 54, and after six months on hormones, most of my old male clothes no longer fit, and when I wear the ones that do, I am starting to look more like a girl trying to dress as a guy than like a guy. This may be okay for work, but one thing about relatives, they tend to notice if your appearance changes from year to year. If you walk into a gathering after a year on hormones, believe me someone is going to notice, no matter what you are wearing.
Something to think about.