I'm being hyperbolic and trying to add levity. My broader point is that I've experienced -- first-hand -- that some people don't respect "Focus Time" as a legit reason to miss _their_ meeting and inconvenience them to find a different time. They might not schedule over it, but they'll slack and ask you if you can join anyway, creating more speed bumps and awkward conversations. People generally don't slack you to ask "Can you miss your Vendor Review to come to our Marketing Brainstorm?" You don't have to go full-on deceptive and make up fake meeting names -- that was a bit of humor -- someone else on this thread suggested "Unavailable," which is probably equally effective.