If you can, see if you can get them rubbed out by an athletic trainer. Of course, it's only two days before, and you don't want to be sore for your meet, so if you get them rubbed out don't get it done too hard. If you can't get that done somewhere, then try stretching them a bit, or using a running stick. Don't stretch too hard, though, you don't want to pull something.

Good luck, maybe you'll wake up in the morning and they'll be all better.

try cramer atomic balm (hot..don't get it on your other parts)
or cramer RED HOT (REALLY FRIGGIN HOT)

I had the same problem a couple weeks ago. My calves and the area below were so tight they couldn't be rubbed out. I talked to a friend of mine and she said  needed to drink more water and use a foam roller. It worked great! I use the foam roller before and after my runs and I haven't had any problems since.