De or het strafzitting?

The correct Dutch article is:

de strafzitting

Rule Words ending in -ing: almost always de. See the rule

How to use strafzitting

the strafzittingde strafzitting
this strafzittingdeze strafzitting
that strafzittingdie strafzitting
our strafzittingonze strafzitting
your strafzittingjouw strafzitting
every strafzittingelke strafzitting
which strafzitting?welke strafzitting?
a big strafzitting / the big strafzittingeen grote strafzitting, de grote strafzitting