Specifically, I was looking to create events on a calendar that was not the “primary” calendar for a user. After poking around and experimenting, I finally got things to work.

First, you can retrieve the list of available calendars with:

$service = Zend_Gdata_Calendar::AUTH_SERVICE_NAME;
$user = sfConfig::get("app_gcal_user");
$pass = sfConfig::get("app_gcal_password");

$client = Zend_Gdata_ClientLogin::getHttpClient($user, $pass, $service);
self::$service = new Zend_Gdata_Calendar($client);
$calFeed = self::$service->getCalendarListFeed();

$arr = array();
foreach ($calFeed as $calendar) {
  $arr[] = array( “title” => $calendar->title->text, “uri” => $calendar->getEditLink(“alternate")->href   );
}

Next, when creating the events pass in the uri and the events will appear on the alternate calendar.

self::$service->insertEvent($event, $arr[1][“uri”]);