?Replace html without forking

I’d like to not have dots representing events within the calendar widget. I was able to do that within google-calendar-events/includes/calendars/views/default-calendar-grid.php by replacing within public function draw_month():

   		echo "\t\t" . '<span class="simcal-day-label simcal-day-number"'
                . $day_style . '>' . $day . '</span>' . "\n";
            echo "\t\t" . $list_events . "\n";
			echo "\t\t";

			echo '<span class="simcal-events-dots" style="display: none;">';
            // Event bullets for calendar mobile mode.
			for( $i = 0; $i < $count; $i++ ) {
				echo '<b style="color: ' . $bullet_colors[ $i ] . ';"> &bull; </b>';
			}

with

        if ($count)
        {
            for( $i = 0; $i < $count; $i++ )
            {
               echo "\t\t" . $list_events . "\n";      // Need this for popup
               echo '<span class="simcal-events-dots"' . $day_style . '>'
                   . $day . '</span>' . "\n";
			}
        }
        else echo "\t\t" . '<span class="simcal-day-label simcal-day-number"'
            . $day_style . '>' . $day . '</span>' . "\n";

Is there a way to make those changes without forking the plugin? I didn’t find a hook or filter that would do that, but I’m not very good with php.