I think open communication is a lot better than posting notice.

One guest communicated that she had no intention of cancelling. 

She was extremely good at communicating, and was completely on board when we asked her for two months of a deposit.

People are equity rich, not tapped out.Here is the link to the full article if you want to take a gander: https://www.keepingcurrentmatters.com/2020/03/16/5-simple-graphs-proving-this-is-not-like-the-last-time/?

All the tenants are your clients and you need to communicate with them all.

What other communication(s) did you receive before the money arrived?

You could find a  "cash rich" Partner whose funds could make your deal work but you will have to give up part of any profit.

Some books I would recommend - What Every Real Estate Investor Needs to Know About Cash Flow, Think and Grow Rich, and The Intelligent Investor.

We communicate several times a month. 

I have actually said, "No pay no stay" to certain tenants, which is always a crowd-pleaser let me tell you - lol (there are better ways to communicate that sentiment).