De or het ticketboeking?

The correct Dutch article is:

de ticketboeking

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

This word is not in the word lists we use to double-check answers.

How to use ticketboeking

the ticketboekingde ticketboeking
this ticketboekingdeze ticketboeking
that ticketboekingdie ticketboeking
our ticketboekingonze ticketboeking
your ticketboekingjouw ticketboeking
every ticketboekingelke ticketboeking
which ticketboeking?welke ticketboeking?
a big ticketboeking / the big ticketboekingeen grote ticketboeking, de grote ticketboeking