Getting Google Calendar events in PHP
Another option is to use the Zend Google Calendar library, it is a separate part of the zend framework so you don't need the whole zend framework
http://framework.zend.com/manual/en/zend.gdata.calendar.html
it is not that hard once you have a look at the examples.
In case it helps anyone else, I figured out how to get calendars other than the default. If you go into your google calendar and look up calendar settings, at the bottom there is a calendar ID that is formatted like a really long email address.(example: adg5jcq8gk7lsp6rrbmrm8c@group.calendar.google.com) Use that with $query->setUser() to use that specific calendar.
As a heads up to anyone using the code, echo $event; didn't display anything for me, so I thought the query was failing.
Here is a snippet that should print something:
foreach ($eventFeed as $event) { echo $event->title->text . '<br />';}