You can display the first sentence of the event by making small changes in the source file. Here you have the steps to achieve it.
1. Don´t forget to take a backup of the files that you are editing, prior to any updates.
2. Login to your admin dashboard.
3. Navigate to Appearance->Editor, select the Main Index Template (index.php) on the right side.
4. You will find a code like below:
<p class=”byline vcard”><?php _e(‘When:’, ‘januas’); ?> <time class=”updated” datetime=”<?php the_time(‘c’); ?>”><?php echo !empty($event_date) ? date(get_option(‘date_format’), get_post_meta($post->ID, ‘januas_eventdata_startdate’, true)) : ”; ?></time>
</p>
5. Replace this with the following code:
<p class=”byline vcard”> <?php
$content =get_the_content();
$pos = strpos($content, “.”);
echo $words = substr($content, 0, $pos);
?></p>
6. Update the file.