zur = zu der
Zu takes the dative case, and since Hochzeit is feminine, the die of Hochzeit changes to der.
Just in case you're still a bit confused:
Zu and In both take the dative case. This means:
Der - Dem
Die - Der
Das - Dem
These can be contracted into the prepositions:
In dem - Im
Zu dem - Zum
Zu der - Zur
As a side note, in can take the accusative case as well. The rule is:
Movement = Accusative (Ich bin ins Kino gegangen. - I went to the cinema.) ins is a contraction of in das, the only one possible with in + acc
No movement = Dative (Ich bin schon im Einkaufszentrum. - I'm already in the shopping centre.)
Hope this helped! :)
I'm struggling to identify the dative case in certain instances. Why is the dative 'zur' used here?
When I look for the dative case I usually: 1) Find the verb (coming) 2) Ask 'what'? (accusative) (The wedding) 3) Find the recipient (dative)
Clearly I am doing something wrong with this example, but I am unsure what! Any help would be greatly appreciated :)
zu is a preposition which starts a prepositional phrase.
Prepositional phrases are outside the "core" parts of a sentence (subject, direct object, direct object).
The case of a noun in a prepositional phrase is decided by the preposition.
In this case, zu always requires dative case.
"to the wedding" is not a recipient -- it's a destination. The German translation here is with a prepositional phrase rather than with a simple case assignment, because it's not a core argument of the verb.