How can I put "the events calendar" events like posts in the slider?

Hi @tomb,

I hope you are well today and thank you for your question.

To achieve this you have to create child theme of activello theme and develop custom solution in it as developed in the following topic for Travelify theme.

https://colorlibsupport.com/t/featured-slider-with-event-espresso-event/

Best Regards,
Movin