Fixed a bug in which the tag for refining the date of an event was not displayed in some environments

【Details of the fix】
■Fixed a bug that the tag for narrowing down the date (year and month) of an event on the top page, event list page, etc. may not be displayed depending on the environment.

The following files have been modified for this update.
【Fixed files】
・inc/event.php
・style.css

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