1. Backup the original files before making any changes.
2. Navigate to Appearance>>Editor and open the Schedule Page Template (template-schedule.php)
3. Look for the line (near line 80)
$content = get_the_content();
4. Add the following lines after the above line
$length = 20;
$shortened = implode(‘ ‘,array_slice(str_word_count($content,1),0,$length));
$content = $shortened.’…<br><a href=”‘ . get_permalink() . ‘”>Read more</a>’;
Here 20 is the number of words to show, you can change it to whatever number of words that you want.
5. Update the file