Well, someone above DID play the "college student" card, which makes sense. Out-of-state (or even out of county) college students don't re-register their cars in the college town and then back again in the summer. I think on the whole you'll be fine, Kestra, without re-registering the car. Again, you're not the owner just the person who happens to be driving it.
It's also "only illegal if you caught" and handed an annoying fine.