Google calendar api - 将日历设置为公开？

I can successfully add a calendar, but unfortunately I can't embed that calendar on remote pages like I want to, because it's not set to public!

I can't find any references to setting the calendar's sharing settings/permissions to public.

EDIT: Found some more info: https://developers.google.com/google-apps/calendar/v3/reference/acl/insert

Seems like this is what I need, I'll report back with exactly how to do this..

EDIT #2: I'm getting good at this!

$rule = new AclRule();
$scope = new AclRuleScope();

$scope->setType("default");
$scope->setValue("");
$rule->setScope($scope);
$rule->setRole("reader");

$createdRule = $service->acl->insert($createdCalendar->id, $rule);

Updated post with answer! Just had to set the "ACL" for default viewer (public) to reader!