IDK. I have not been there during COVID, but I've always walked in without an appointment. Of course my visit takes 3 or 4 hours (no appointment). But I don't mind. Incidentally, I live in the area, and at 9am there is always a line of people waiting to go in. I can't believe that everyone has an appointment. Good luck.
Yes except if it's just to pick up your glasses.
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