Yes. There really is a national day for that delicious beverage staple, the dry martini. It is a classic though, no vodka allowed. Wikipedia has an informative post about the drink, including a few recipes.
It's after dinner here in the eastern U.S. and about time for a relaxing drink if one is so inclined. If so, here is some perfect jazz to accompany the progression of Friday evening and the close of National Dry Martini Day.
n.b. John Coltrane's Blue Train, released in 1957, consistently ranks among the top jazz albums of all time. Another fine jazz album for even easier listening is John Coltrane and Johnny Hartman, released in 1963 and also ranked among the very best jazz vocal albums of all time.