In October 2003 Ms Cheetham performed World In Union with Argentine tenor Jose Cura at the Opening Ceremony for the Rugby World Cup. This performance was broadcast to a worldwide audience estimated at more than one billion.

In May 2005 Ms Cheetham added to her list of international credits several engagements in Paris including performances at the Australian Embassy and the on stage at La Cigale in the Marais.

In August 2000 Ms Cheetham was commissioned to write and perform an original composition, Dali Mana Gamarada, which she would later perform as the welcome to country at the Opening Ceremony of the Sydney 2000 Olympic Games. Deborah later collaborated with Wicked Beats Sound System to record Dali Mana as the lead track for Festival Records 2001 CD Corroboration.

"Opera diva Deborah Cheetham and Wicked Beat Sound System create the ethereal Dali Mana Gamarada."
The Bulletin

Throughout 2001 Ms Cheetham performed in several major events celebrating the Centenary of Federation including January 1st when she appeared as a soloist and speaker in a Concert broadcast nation wide from Centennial Park in Sydney. Other events included Ceremony at the Melbourne Concert Hall and Peoplescape - broadcast nationally on the ABC from Parliament House in Canberra.

"Soprano Deborah Cheetham.performing the most achingly beautiful Italian and French arias.treating us with her gorgeous singing"
The Age (Australia)

During 2002 Ms Cheetham performed in Melbourne at the 2002 Australian Business and Arts Foundation Award Dinner. In May that year she performed with Simon Tedeschi in a concert honouring His Holiness the Dalai Lama held at the Sydney Opera House.

"Strauss.in the hands Simon Tedeschi and Deborah Cheetham evokeda magic equal to that of the Gyuto Monks' chants."
World Tibet Network News

In November 2002 Ms Cheetham gave a world premier performance of True, a newly commissioned work by Australian composer Martin Wesley Smith. This performance was recorded live for ABC radio.