There should be a publicly accessible page with contact info, locations, date/time.
It can be a static page. If you want you can have links to facebook. It can be done for free.
I’ll even do it for you if you provide the info. Or just get rid of the password protection, easiest of all.
I just found this article and posted here...and I don’t get any such message to view the article or on Facebook....maybe it’s because I have a Facebook account, I don’t know, but I have no idea what you are talking about re: password protection.