If you have many different calendars in the Calendar app, your screen might appear cluttered, making it difficult to find what you are looking for. For instance, you might want to see only all upcoming birthdays for the current month and not all of the other events on your calendar. To quickly hide all the calendars except for one, hold down the ⌘ key and then click the checkbox for any calendar to deselect all of your calendars. Then, click the checkbox for the calendar you want to display. Events only for that calendar will appear.

To redisplay all of your other calendars, hold down the ⌘ key again and click the checkbox next to any of the other calendars. All of your other calendars will once again be selected.

I’ve heard some people claim that the Calendar app that comes packaged with OS X is not very user unfriendly, requiring several clicks with the mouse in order to add or edit an event. This may have been true in the past but no longer. In fact, with the latest rendition of the Calendar application, you can enter or update an event without ever removing your fingers from the keyboard.

Follow along with the steps below to try it yourself.

Quick Guide: Add a Calendar Event without using your Mouse

1. Open the Calendar application.
2. Press the ⌘ + N keystroke combination to display the Quick Entry box.
3. Type out the event, including date & time in natural language (Example: Dinner with Mom on Friday at 7:00 p.m.).
   
4. Press Return. The event is added and the Edit Event box is displayed.
5. If you wish to change the title of the event, type in the new title.
6. Press Tab twice to move to the Location field.
7. Type the location of the event, if desired.
8. Press Tab to move to the Event Details area.
9. Press Return to expand the Event Details area.
   
10. Tab through each field and make any necessary changes to the details.
11. Tab until you reach the Add Invitees field.
12. Typing the name of any Attendees you want to invite. Matching entries in your Contacts will display as your type. Press Return when you find a matching contact.
13. Tab to the Add Notes or URL. Press Return to expand the section.
14. Type any notes you wish to add to the event.
15. When finished, press Tab until the Apply or Send button is highlighted.
16. Press the Spacebar.
17. Press Esc.
18. To edit an existing note, navigate to the event you want to edit and press Return. Tab through the event, making any desired changes as noted above.