Early Lease Termination

I move out on 12/15/2019. Can I be charged for an early termination fee?

As long as you've paid through the end of the month almost certainly no.

When moving apartments, it's normal to move out a week or two beforehand so you have time to get all your utilities moved and ensure nothing has been left behind. Especially near Christmas, I would expect a move-out date around the 15th.

If you stay past your lease, I'm not sure what would happen. Since you have no legal right to stay there past the lease agreement I'm not sure eviction is the right word. Either way, I wouldn't wait around to find out.