De or het protestmeeting?

The correct Dutch article is:

de protestmeeting

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

How to use protestmeeting

the protestmeetingde protestmeeting
this protestmeetingdeze protestmeeting
that protestmeetingdie protestmeeting
our protestmeetingonze protestmeeting
your protestmeetingjouw protestmeeting
every protestmeetingelke protestmeeting
which protestmeeting?welke protestmeeting?
a big protestmeeting / the big protestmeetingeen grote protestmeeting, de grote protestmeeting