What to do if my prospective employer invited me to an interview but forgot to tell me where I'm suppose to go?

First, I should probably specify that they're a national organization that's mostly ran online (but they have webinars/live workshops and conferences) and they have no permanent locations. So I was invited for an interview shortly after applying for a position and when I first answered I asked for the specific time and location of the interview but I was only given a specific time tomorrow. I then sent another email (4 days ago) asking whether this would be a video interview or if I'm expected to show up to a specific place and still no answer (I should note that it's taken this person 4 days exactly to answer my 3 previous emails maybe an extraterrestrial time zone). The interview is tomorrow afternoon, what should I do?

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