De or het shopsessie?

The correct Dutch article is:

de shopsessie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use shopsessie

the shopsessiede shopsessie
this shopsessiedeze shopsessie
that shopsessiedie shopsessie
our shopsessieonze shopsessie
your shopsessiejouw shopsessie
every shopsessieelke shopsessie
which shopsessie?welke shopsessie?
a big shopsessie / the big shopsessieeen grote shopsessie, de grote shopsessie

Dutch words ending in shopsessie

fotoshopsessie

In compound words, the last part decides the article. See the rule