To automatically add holidays to your Yahoo! Calendar with the Time Guides feature:

1. Make sure that you are signed in to your Yahoo! Calendar account.
2. Click "Calendar Options" on the right side of the page, then "Time Guides."
3. Under the Holidays heading, click the "Add/Edit Holidays" link.
4. Select the holidays you want to include on your calendar. Other holidays (North American, Latin American, European, African, Oceanian, Asian, and Religious) are found in the category pull-down menu.
5. Under the Show in Calendar column, select the calendar view you want to see the holidays in: day, week, or month.
6. Click the "Save" button after you're finished editing the Time Guides.

If after following the steps above, holidays are still not showing in your calendar, you might have your Time Guides hidden. Go to your day or week view calendar and click the "Show" link next to the My Time Guides header (below the printable view link). Then, if you want to hide the Time Guides events at a later time, you can click the "Hide" link.

Note: There is only one text link, which toggles between "Show" and "Hide."