I do this, except without the foolery. I schedule recurring blocks on my calendar like "Focus time" and "Personal time" so people know that scheduling meetings with me during those blocks may not result in my attendance.

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tyre 2 hours ago | parent [-]

I tried generic ones but they were schedule over :(

	▲	magneticnorth 2 hours ago \| parent \| next [-]
		YMMV whether this will fly in your company culture, but I titled mine "Focus time, please ask before scheduling". And when people inevitably didn't ask, I'd just decline unless I especially wanted to attend. I find myself getting invited to meetings sometimes just because the organizer wants to be inclusive and make sure everyone is looped in who might want to be, and I figure that's what's going on if they added me without asking. If it's really important for me to be there, they'll see my time block and ask me.
	▲	rukuu001 2 hours ago \| parent \| prev \| next [-]
		Google Cal will auto-decline meetings that occur during ‘out of office’ events. I have several of these ‘out of office’ events recurring in my calendar that I use for concentrated work
	▲	minkzilla 2 hours ago \| parent \| prev [-]
		To make them stick you have to decline meetings scheduled during that time