When's the last time you knew you were going to have fun for 12 days straight?
I know, we don't often look at things that way, and that is precisely the beauty of celebrating the "12 Days of Valentine's Day". It's a time when you do little things to show love for family, friends and while you're at it, yourself. Wear pink one day, make a cake, put out red placemats - everything counts when you are celebrating the fact that you love a lot of people.
There is no set schedule; Nor is there a "number" relationship, meaning you don't have to sneak 10 Hershey kisses into a loved one's pocket just because it is Day 10 (but what a great idea!). Nope, you just do what feels right (and fits into your schedule) on any particular day leading up to Valentine's Day. When someone compliments your pink scarf, just smile and say that its in honor of the 12 Days of Valentine's Day. If your neighbor questions your sudden gift of 6 muffins, cite your inspiration, The 12 Days of Valentine's Day. Have fun with it.
Remember, this is a gift of the heart, so any gesture, no matter how small, will be appreciated. I've added a link at the top/right of my Moments Of Delight blog. Click and you can read a collection of my blog posts from prior years (I think there are 50 some posts!) to get ideas.