Just a quick snippet for getting multiple calendar months (in this case two) to display using Events in Perch. Please feel free to use, abuse and improve, obviously.

gistfile1.phtml

<div id="calendars">
	<?php 
	$opts = array(
		'past-events'=>false
	);
	// this months calendar
	perch_events_calendar($opts);
	// if we have a date in the url, use it, otherwise, get today's date
	if ( isset( $_GET['d'] ) && !empty( $_GET['d'] ) ) {
		$date = $_GET['d'];
	} else {
		$date = date('Y-m');
	};
	// add a month to the date we used
	$newdate = strtotime(date("Y-m-d", strtotime($date)) . " +1 month");
	// trick perch as to the actual date.
	$_GET['d'] = date("Y-m", $newdate);
	//next months calendar
	perch_events_calendar($opts);?>
</div><!-- #calendars -->
<?php
//put the buttons under both calendars, rather than twice, using another template.
$btn_opts = array (
	'past-events'=>false,
	'calendar-template'=>'events/calendar/calendar-buttons.html'
);
// reset the date
$_GET['d'] = $date;
// the navigation buttons
perch_events_calendar($btn_opts);
?>