How do I connect to the Google Calendar API without the oAuth authentication?

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If I’m not wrong, they’ve launched Service Account for this now: https://developers.google.com/accounts/docs/OAuth2ServiceAccount

Edit:

Here’s the modification from their Prediction API

    session_start();
    require_once "google-api-php-client/src/Google_Client.php";
    require_once "google-api-php-client/src/contrib/Google_CalendarService.php";

    const CLIENT_ID = '...';
    const SERVICE_ACCOUNT_NAME = '...';

    // Make sure you keep your key.p12 file in a secure location, and isn't
    // readable by others.
    const KEY_FILE = '...';

    $client = new Google_Client();
    $client->setApplicationName("...");


    if (isset($_SESSION['token'])) {
     $client->setAccessToken($_SESSION['token']);
    }

    // Load the key in PKCS 12 format (you need to download this from the
    // Google API Console when the service account was created.
    $key = file_get_contents(KEY_FILE);
    $client->setAssertionCredentials(new Google_AssertionCredentials(
        SERVICE_ACCOUNT_NAME,
        array('https://www.googleapis.com/auth/calendar', "https://www.googleapis.com/auth/calendar.readonly"),
        $key)
    );

    $client->setClientId(CLIENT_ID);
    $service = new Google_CalendarService($client);

    //Save token in session
    if ($client->getAccessToken()) {
      $_SESSION['token'] = $client->getAccessToken();
    }

    //And now you can use the code in their PHP examples, like: $service->events->listEvents(...)

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