Queen's Brian May said: "We’re very happy to be able to do our bit to help Australia to fight back against the terrible fires."
The film will follow the behind-the-scenes activities between Lambert and original Queen members Brian May and Roger Taylor since Lambert’s American Idol debut in 2009.
Last year's event saw headlining sets from Queen + Adam Lambert, The Killers and Arctic Monkeys.
'Bohemian Rhapsody', the widely-acclaimed biopic about late Queen frontman Freddie Mercury, is up for five Oscars including Best Picture.
The film soundtrack is already becoming one of the band's fastest-selling albums throughout the world.
The epic 23-date arena and stadium tour is set to run from mid-July through late August with an all new concert experience.
Queen + Adam Lambert have announced 'The Crown Jewels': a limited 10-date run of shows at the Park Theater at Park MGM in Las Vegas for September.
Queen + Adam Lambert have been confirmed to headline Scotland's TRNSMT Festival with Liam Gallagher, Stereophonics and The Killers
Following their rapturously-received UK shows over the winter, Queen + Adam Lambert have announced further UK and European shows for 2018
Queen announce details of Freddie Mercury 71st Birthday Party and their forthcoming 'News Of The World' documentary which will be screened at the party
Queen + Adam Lambert and Universal Music are teaming up to produce a new virtual reality concert 'VR The Champions' available on iPhone devices
The Who's Roger Daltrey and Pete Townshend and Queen's Brian May have contributed to the charity benefit single being released for Grenfell Tower
Queen + Adam Lambert have announced 12 UK and Irish dates as part of a 24-date European tour in November and December 2017.