Newps wrote:
I kept the tower open an extra hour or so

Does that mean the Class D Airspace was in existence an extra hour too?
What happens if I dutifully read my AFD and discover that the tower (and
the associated CDAS) closes at midnight, so I figure when I arrive at 12:30
I don't need to talk to anybody.

I fly in, enter the pattern, land, and taxi to the ramp without bothering
to self-announce. Have I broken any regulations?