This may be a pretty tough challenge. Ideally, you'd want to get a date for this weekend, and play it into a date next weekend. Even then, the day itself could be awkward. Seems like too much work.
In my experience, hooking up on Valentine's out at a bar was totally easy. If you aren't smooth, tell people your girlfriend dunped you last week or something to get some PITY ACTION going on.
Also, since when do guys honestly care about being lonely on Valentine's day anyway? That's kind of emo.

:'(