The other V-day is primarily for women. Vampires are for everyone. It's easier to find something for a Male on Vampire's day. A single red rose is acceptable for a Vampire's day gift. Actually it's the common gift, instead of a card.
Vampires come from all nationalities and races.
Instead of the one St. Valentine of the Christian Religion. The Simularities are already there. The holiday already starts with a V, and can shortened to V-day. Hearts and the color red are common items to a vampire. Lace is worn by many a vampire.