You can save time managing your manager's calendar (and your own) by using keyboard shortcuts.
To enable keyboard shortcuts, select Settings from the Settings gear drop-down in the upper right corner of your screen.
Once you’ve enabled keyboard shortcuts, you'll be able to perform common tasks without moving your hands from the keyboard. For example, type “c” to create an event, “e” to see event details, “t” to go to today’s date, “p” to go to the previous period, “n” to go to the next period, “s” to go to your Calendar account settings, and much more.
While working in Google Calendar, type “Shift+?” at any time to display a complete list of keyboard shortcuts (keyboard shortcuts must first be enabled).