"Aici este adunarea austriecilor?"

Translation: Here is the gathering of the Austrians?

[Lng52-._]

How about: "Is the gathering of the Austrians here?"

[Lurch_M]

That's also correct, and to me it sounds better than Duolingo's main translation.

[KevinSmith777042]

As a question "Here is the..." is not just less natural sounding than Lng52-._'s answer. It is wrong. Reported.

[ConchiCastillo]

The option to report an ungrammatical English translation is missing. I must have a different menu to report the errors.

[Iris-92]

Can't you say "Austrian gathering"?

[eharwagon]

Haha no :)

You have to have a verb in there!
I'd say:
"Is the Austrian gathering here?"
The reply would be:
"Yes, the Austrian gathering is here."/"No, it is not here."

[Lurch_M]

She was asking if "the Austrian gathering" is a valid expression in English. And it seems the answer is yes, based on your post.

[CarloGamag1]

How do we know it is question in a conversation? In other Latin derived intonation is used. In Duolingo obviously the question mark is used.

[Lurch_M]

Yes, you would know this from the intonation.