[DarrinM]

MarcoH64 Kindly provided a fix for me and I am posting this for anyone else who requires it

Edit 'includes/functions_calendar.php'.

Find:

PHP Code:

$event['title'] =  htmlspecialchars_uni($event['title']); 


Add after:

PHP Code:

// Start Hack custom field on calendar month view (MarcoH64)
                            $customfield=unserialize($event['customfields']);
// End Hack custom field on calendar month view (MarcoH64) 


Now edit the template 'calendar_monthly_event':

Find (or any other place):

<a href="calendar.php?$session[sessionurl]do=getinfo&amp;e=$event[eventid]&amp;day=$year-$month-$day&amp;c=$calendarid" title="$event[preview]">$event[title]</a>

And add below (please change it to suit your needs/fieldnumbers):

<!-- Start Hack custom field on calendar month view (MarcoH64) -->
		<br />$customfield[1] - 
		<if condition="$customfield['2'] == 'OFF'"><font color="red"><else /><font color="green"></if>
		$customfield[2]
		</font color></if>
		<!-- EndHack custom field on calendar month view (MarcoH64) -->

Note: "OFF" is one of my custom fields drop down options, yours of course will be different

Many thanks to MarcoH64