Yes you can, although you will lose your changes everytime you update your theme, (which might be why you can’t find the code if you made the change before).
To avoid this, we recommend adding code for customizations into a functions plugin.
Here’s an example of some code that will also change the title that appears at the top of the event list shortcode output:
The support post ‘Change Upcoming Events to Upcoming Classes’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.