Google Calendar and putting events into calendars

Hello there

Can anyone tell me what exactly needs to go into this bit of code?

response = g.new_event(event, 'my_NOT_default_calendar') #post data to that calendar puts response.body

All the code is here, thanks to Ben by the way

http://googlecalendar.rubyforge.org/svn/examples/ruby_standalone/gdata_new_event.rb

Does anyone know what pieve of information from your calendar would you put in that field, I've tried all the pieces of information I get back from get_calendars() and I can't make it work.

If anyone has any ideas I'd be more than grateful.