Tribe: Change Community Events Error Message

functions.php

// Add to your active theme's functions.php

add_filter( 'tribe_community_events_form_errors', 'ce_custom_error_msg' );

function ce_custom_error_msg( $errors ) {
    // Don't filter if it is an 'update' or other type of message
    if ( $errors[0]['type'] != 'error' ) return $errors;

    $existing_errors = '';
    $type = 'error';

    if ( is_array( $errors ) ) {
        $existing_errors = $errors[0]['message'];
        $type = $errors[0]['type'];
    }

    // Set overall message by appending a heading to the front
    $errors[0] = array(
        'type' => $type,
        'message' => '<h5>You did not do something critical</h5>' . $existing_errors
    );

    // User str_replace to choose a specific message to change
    $errors[0]['message'] = str_replace( 'Event Title is required', 'You need to add a title', $errors[0]['message'] );

    return $errors;
}