Hi Again,
Thanks for purchasing Facebook Events. I can help get you in the right direction.
There is no feature to limit the characters be default.
It does take a little coding that can be done following our themer’s guide:
https://theeventscalendar.com/knowledgebase/themers-guide/
Use that guide to move this template to your theme to safely edit:
the-events-calendar\views\list\single-event.php
There you would have to replace <?php the_excerpt() ?> with a function to limit the amount of content to how you would like it.
Let me know if you have any follow up questions.
Thanks