Hi David,
Thanks for posting 🙂
I’d definitely recommend reading through our Themer’s Guide in the first instance, as this covers many of the basics needed to customize our views.
In this case specifically you might override month/content.php and modify:
<h2><?php tribe_events_title() ?></h2>
To something like:
<h2> Your custom title </h2>
For the secondary heading that appears, you might make a similar change but in month/mobile.php and change:
<h3>[[=i18n.for_date]] <span>[[=raw date_name]]</span></h3>[[ } ]]
To whatever makes sense for you:
<h3> Custom sub-heading </h3>[[ } ]]
If you prefer to do this via the language files, please do remember that you must compile the .po files into .mo files or they cannot be used by WordPress.
Does that help?