De or het rolzitting?

The correct Dutch article is:

de rolzitting

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

How to use rolzitting

the rolzittingde rolzitting
this rolzittingdeze rolzitting
that rolzittingdie rolzitting
our rolzittingonze rolzitting
your rolzittingjouw rolzitting
every rolzittingelke rolzitting
which rolzitting?welke rolzitting?
a big rolzitting / the big rolzittingeen grote rolzitting, de grote rolzitting