De or het thema-middag?

The correct Dutch article is:

de thema-middag

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

How to use thema-middag

the thema-middagde thema-middag
this thema-middagdeze thema-middag
that thema-middagdie thema-middag
our thema-middagonze thema-middag
your thema-middagjouw thema-middag
every thema-middagelke thema-middag
which thema-middag?welke thema-middag?
a big thema-middag / the big thema-middageen grote thema-middag, de grote thema-middag