它是在服务帐户拥有的日历中创建事件，如果你想管理它，你必须与自己共享日历(！):

It's creating the event in the calendar owned by the service account, if you want to manage it, you have to share the calendar with yourself (!):

$scope = new Google_AclRuleScope();
$scope->setType('user');
$scope->setValue('YOUR-EMAIL-HERE');

$rule = new Google_AclRule();
$rule->setRole('owner');
$rule->setScope($scope);

$result = $service->acl->insert('primary', $rule);

参考:谁拥有服务帐户通过 Google Calendar API 创建的日历以及如何共享这些日历?

PS:有新版本的 PHP 客户端库.

PS: there's a new version of the PHP client library.