Instead of Mon, Tues, etc., you can have the Month View show the days of the week as the full day names (e.g. Monday, Tuesday, etc.). Here’s an example:
Perform a template override, by making a copy of ‘/wp-content/plugins/the-events-calendar/src/views/v2/month/calendar-header.php’ and place in the ‘/tribe/events/v2/month/’ folder in your theme.
Look for the following line:
<?php echo esc_html( $wp_locale->get_weekday_abbrev( $day ) ); ?>
Then replace that with this new code:
<?php echo esc_html( $day ); ?>
The template grabs the short form of the weekday via WordPress’s locale helpers, then uses that in the table header. Instead, we use the full day name.