De or het toneelvertoning?

The correct Dutch article is:

de toneelvertoning

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

How to use toneelvertoning

the toneelvertoningde toneelvertoning
this toneelvertoningdeze toneelvertoning
that toneelvertoningdie toneelvertoning
our toneelvertoningonze toneelvertoning
your toneelvertoningjouw toneelvertoning
every toneelvertoningelke toneelvertoning
which toneelvertoning?welke toneelvertoning?
a big toneelvertoning / the big toneelvertoningeen grote toneelvertoning, de grote toneelvertoning