Scenery

All of the airports in this event are represented in the default FS9 and FSX sceneries: you don't need any add-on scenery to take part in the event.

But there are a number of scenery packages available that improve the visuals for some of the places you'll be flying, and these are listed below.

Christchurch

ORBX New Zealand - South Island FSX Payware

This package, available here, provides stunning high res scenery for all of New Zealand's South Island (including Christchurch Airport).
Christchurch International Airport v1.3 FSX Freeware

For those FSX pilots looking for a freeware option, this scenery by Troy Chapman replaces Christchurch Airport (NZCH).
Christchurch International (NZCH)FS9 Freeware

A freeware FS9 scenery for Christchurch (NZCH), available here, by Alistair Slee, Jason Hunt, and Ian Warren.

New Caledonia FSX Freeware

A complete scenery with all the islands of New Caledonia, available here, by Marc Guitteny.
NWWW (Noumea-La Tontouta) Airport AFCAD FSX Freeware

This scenery, available here, makes a number of small tweaks to the default airport at Noumea, primarily around AI improvements.

ORBX Australia FSX Payware

This scenery, available here, provides custom mesh and land class for the entire continent of Australia.

Note, for those looking for a cheaper version, ORBX also sell their Australian scenery split into four separate regional products: the area around Sydney is covered by AU Blue.
Vista Australis - YSSY Sydney Kingsford-Smith International FS9 Freeware

This freeware FS9 scenery updates the default for Sydney (YSSY) providing numerous layout and visual improvements.

Version 2.2 is available here.

Version 2.3 is a recommended update that brings the aprons and taxiways up to their current real world configuration. It is available here. Note, it requires v2.2 be installed first.