Hi Edgar,
Thanks so much for your interest in our plugins! While we do offer a variety of sidebar widget options for The Events Calendar and Events Calendar PRO, at this time, no widget options are available for ticket sales specifically. However, you may be able to incorporate this functionality into one of our existing widget formats via a template customization! This Knowledgebase article provides a list of all widgets that are currently available for our plugins:
https://theeventscalendar.com/knowledgebase/events-calendar-widgets/
If you’re interested in diving into customizations for our products, our Themer’s Guide is a great place to start–you’ll find plenty of helpful suggestions there, as well as a complete list of all modifiable templates for our plugins.
https://theeventscalendar.com/knowledgebase/themers-guide/
I hope that helps to get you started here! 🙂 Thanks again, and please don’t hesitate to follow up if you should have any other questions!