De or het veekering?

The correct Dutch article is:

de veekering

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

How to use veekering

the veekeringde veekering
this veekeringdeze veekering
that veekeringdie veekering
our veekeringonze veekering
your veekeringjouw veekering
every veekeringelke veekering
which veekering?welke veekering?
a big veekering / the big veekeringeen grote veekering, de grote veekering