You're in Perth, but the rest of the team are back in the office in Sydney. Rather than schedule an important meeting during your lunch, you can use Google Calendar's new time zone support to ensure everybody knows the real start time.
The latest upgrade to Google Calendar makes good sense for those working with others in different time zones, though it's a link you have to click to the right of your time entry field to enable. It makes even more sense for those flying into other time zones, as you can set an event to start in one time zone and end in another, showing you the real time you have to get things done.
Event time zones in Google Calendar [Official Gmail Blog]