Hello -

In Calendar, on the View menu, point to Arrange By, point to Current View,
and then click Events.
Select the holidays you want to remove. To select multiple rows, press the
CTRL key and click subsequent rows.
Click Delete  on the Standard toolbar (toolbar: A bar with buttons and
options that you use to carry out commands. To display a toolbar, press ALT
and then SHIFT+F10.).

To quickly remove all of the holidays for a country/region, click the
Location column heading (column heading: The horizontal bar at the top of one
column in a table. There are multiple column headings in the column heading
row.) to sort the list of events so that it displays all of the holidays for
a country/region together.
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Hope that helps!
Angie