This works like a charm.
Step #1: Approach the person with whom you want to go out on Valentine's Day.
Step #2: Ask said person, "Hey, I want to get your opinion - I want to do something with this guy/girl I know on Valentine's Day, but not in a romantic way, you know, just so we both aren't hanging out by ourselves at home; how would you go about asking them in a way that just says, 'I'm not trying to put the moves on you, I want to hang out just as friends and have fun?'"
Step #3: Listen to your friend share his/her opinion, then immediately ask him/her to hang out in precisely the way he/she suggested.
Bam! You have a date for Valentine's Day! Now, go buy some chocolates for your date, you smooth-talking charmer, you.😉
