12.3 die hochzeit

Hello, 

why in the sentence (geht es mit dem Fotografen zum Schlosspark)
did we use (geht es) to refer to "we are going" instead of (gehen uns/wir) ??

As Lucia hasn't answered yet, I asked my German friend about this and she said that both "gehen wir "and "geht es" are fine, but "geht es" is more colloquial. I guess Germans use impersonal constructions more than we do in English.

well i think that rocket languages should put the colloquial use of the language as a side note because it can be very misleading learning the lessons and taking everything for granted :D

I think when I said colloquial, it may have been misleading, perhaps conversational would have been better.
My german friend's sister is a German teacher in the US and when I have asked her to explain something she says " don't worry about why, it's just what people say" :-) 
I suppose a language evolves organically from what native speakers say with no particular rhyme or reason for it.

In fact we could use an impersonal construction for this sentence in English, some thing like "After signing the register it's on to the park for the photos".

I did the Rosetta beginners course and although they have a completely different approach to Rocket, they both have the same issue that they concentrate on learning phrases without worrying too much about explaining the grammar. Rocket is actually better in this respect.