Charlotte joined close to 400 young people across Australia who received a Gold Award.
Charlotte also had the chance to meet His Royal Highness Prince Edward, Earl of Wessex KG GCVO.
Seventeen prominent Australians were part of the celebration.
They included Deborah Thomas, Marc Fennell, Naomi Simson, David Campbell OAM, Indira Naidoo, Je McMullen, Janine Perrett, Jayne Azzopardi, Graham Ross VMM, Dawn Fraser AC, Jack Thompson AM, Je Loy, Dan Illic, Layne Beachley AO, Kirk Pengilly, Eddie Woo, and Jacinta Tynan.
Also in attendance was Gladys Berejiklian MP, Premier of NSW, Lord Mayer of Sydney Clover Moore, Gary Nairn AO, Chairman of the Award in Australia, and Peter Kaye AM CEO of the Award in Australia.
IGS congratulates Charlotte on achieving the highest level of this series of awards.
In related news, a number of Year 9 students recently attended a Duke of Ed camp.