Out of office - Google Calendar
When you indicate that you are out of office, your calendar will automatically decline all meetings during that time.
On your computer, open Google Calendar.
At the top of your calendar, click the first date you’ll be out of the office.
Click Out of office.
Select the dates that you’ll be out of the office. You can also specify a time.
Optional: To schedule out-of-office events that repeat, below the day and time you select, click the drop down menu next to “Does not repeat” choose a frequency.
Optional: Change your decline settings and edit your decline message.
Click Save.