Hey Cristina,
The “Cost” field is intentionally replaced by the Tickets field when you have Event Tickets active on a site alongside The Events Calendar. This is by design, so that the “cost” that displays in the front-end views is just whatever ticket price can be pulled from the tickets you’ve created for the event.
I’m sorry if this limitation is disappointing โย it’s something we’ve gotten mixed feedback about and so this current configuration may change in the future, but for now this is unfortunately the nature of the plugins ๐
Thanks,
George