De or het lustrumcommissie?

The correct Dutch article is:

de lustrumcommissie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use lustrumcommissie

the lustrumcommissiede lustrumcommissie
this lustrumcommissiedeze lustrumcommissie
that lustrumcommissiedie lustrumcommissie
our lustrumcommissieonze lustrumcommissie
your lustrumcommissiejouw lustrumcommissie
every lustrumcommissieelke lustrumcommissie
which lustrumcommissie?welke lustrumcommissie?
a big lustrumcommissie / the big lustrumcommissieeen grote lustrumcommissie, de grote lustrumcommissie