De or het themabespreking?

The correct Dutch article is:

de themabespreking

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

This word is not in the word lists we use to double-check answers.

How to use themabespreking

the themabesprekingde themabespreking
this themabesprekingdeze themabespreking
that themabesprekingdie themabespreking
our themabesprekingonze themabespreking
your themabesprekingjouw themabespreking
every themabesprekingelke themabespreking
which themabespreking?welke themabespreking?
a big themabespreking / the big themabesprekingeen grote themabespreking, de grote themabespreking