Most of the functions in the template tags file are pluggable. This means you can declare your own function of the same name in your own plugin and as long as your custom plugin file loads before template-tag.php loads, your function will be used instead.
Here’s a link to a reference that explains more about how to use & override pluggable functions:
The support post ‘Override Template Tags FIle’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.