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Follow it through. Let us see how it goes.
Just DONT EVER EVER go to a "not so opened" location for interviews.

There could be a number of reasons for that to happen.
Forget about the Saturday interview and focus on the more important opportunities that awaits you.

It is possible that the person that interviewed you is a freelance recruiter doing it for someone and has chosen terra culture as the venue of the interview. However, we must always be careful where we go for interviews. Terra Culture might sound safe because its a known name.

About not mentioning the name of the company, it happens and this is why recruiters do it. They do not want you to know the name of the company because the interview is at a preliminary stage and they dont want a situation where you may use your influence to get to lobby with the company when they have not progressed you to the next stage.

It is also possible that the employer has informed them that they should not disclose the name yet. This may be because there is still someone in that role that they do not want to know that they are interviewing for her job. It may also be because they do not have an approval to recruit for the role, so they dont want a situation where words have gone out and there is no approval.

A couple of other reasons why people do it but it does happen in this part of the world.

If you are short-listed after you interview, they will still tell you.