But if you really want a block... plop this into a php block
global $context, $scripturl, $txt;
echo '
<div class="sub_bar">
<h4 class="subbg">
<a href="', $scripturl, '?action=calendar' . '"><span class="main_icons calendar"></span> ', $txt['calendar_upcoming'], '</a>
</h4>
</div>
<p class="inline holiday" style="padding: 2px 0;">
<span>', $txt['calendar_prompt'], '</span><br>
</p>';
ssi_todaysHolidays();
echo '
<p class="inline" style="padding: 2px 0;">
<span class="event">', $txt['events_upcoming'], '<br></span>';
ssi_todaysEvents();
echo '
</p>';