You can edit templates/jf_event-up/templateDetails.xml, add the field after field sitetitle (line 82):
<field name="sitedescription" type="text" default=""
label="JGLOBAL_DESCRIPTION"
description="JGLOBAL_SUBHEADING_DESC"
filter="string" />
Edit templates/jf_event-up/index.php, modify:
elseif ($this->params->get('logoAs') == 1 && $this->params->get('sitetitle'))
{
$logo = '<span class="site-title" title="' . $sitename . '">' . htmlspecialchars($this->params->get('sitetitle')) . '</span>';
}
to:
elseif ($this->params->get('logoAs') == 2 && $this->params->get('sitetitle'))
{
$logo = '<span class="site-title" title="' . $sitename . '">' . htmlspecialchars($this->params->get('sitetitle')) . '</span>';
}
Then config template, enter title and description. Now you can show title and description (2 lines).
Maybe, you have to style for this.
joomfreak