This is the 15866th most frequent Turkish word.
törenini
The Turkish word "törenini" means "its ceremony" or "the ceremony of it."
The word 'törenini' refers to possession (graduation ceremony) by the noun it's connected to (mezuniyet) in the accusative case, indicating the object being watched.
Mezuniyet törenini izlemek için okula gittim.
I went to school to watch the graduation ceremony.
Here, 'törenini' specifies whom or what the action (liking) is directed toward, being the opening ceremony in this case.
Açılış törenini herkes çok beğendi.
Everyone liked the opening ceremony very much.
In this context, 'törenini' refers to the accusative form of 'düğün töreni' (wedding ceremony), effectively marking it as the object of the action of organizing.