Blocking out your calendar for the day in Google Calendar and marking the event as 'Busy' is a quick way to defend a full day from meetings. This will tell calendar platforms and scheduling services that you are unavailable for meetings.

But if you want to make the most of your meeting-free day, you can set a smart No-Meeting Day using the hashtag #reclaim_free. Reclaim will mark the day as busy for new meeting invitations, but keep you free to schedule Tasks and Habits so you can focus on productive work.

Reclaim supports several event hashtags in Google Calendar. To create a No-Meeting Day:

You can use the #reclaim_free hashtag for all-day events to protect a full day from meetings, or add it to individual events to defend a specific time block on the calendar.

With an event like this on your calendar, you'll appear busy to anyone seeking time for a meeting, but will still appear as free to Reclaim — allowing all your Habits and Tasks to get scheduled in your No-Meeting Day.

To defend a No-Meeting Day every week, set the event to repeat on your preferred cadence. The hashtag will be automatically applied to future events to keep your time defended from meetings.

To create a No-Meeting Day for your whole team or company, follow the same steps as above, adding #reclaim_free into the description of the event, and simply 'Add guests' to invite other team members to the event. You can also do this by creating a separate "No Meeting Day" calendar and invite team members or a company alias to events on that calendar.
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When team members RSVP Yes or Maybe to the event, the No Meeting Day will take effect. Now the whole team has time defended from meetings to get independent work done.

Note: Setting a No-Meeting Day will not delete already scheduled meeting events on those days.