De or het protocollering?

The correct Dutch article is:

de protocollering

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

How to use protocollering

the protocolleringde protocollering
this protocolleringdeze protocollering
that protocolleringdie protocollering
our protocolleringonze protocollering
your protocolleringjouw protocollering
every protocolleringelke protocollering
which protocollering?welke protocollering?
a big protocollering / the big protocolleringeen grote protocollering, de grote protocollering