Oscar winning actress Cate Blanchett will appear as the star attraction at a major fundraising event for the opposition's most senior woman in Federal Parliament – Tanya Plibersek.

Blanchett is billed to appear at the Margaret Whitlam dinner in Sydney next month. The online promotional material for the fundraiser highlights Blanchett's climate change activism.

Cate Blanchett, pictured speaking at Gough Whitlam's funeral last year, will be the star attraction at a Tanya Plibersek fundraiser next month. Credit:Peter Rae

"As an actor, story teller, climate change activist and leading voice for women in public life, Cate Blanchett brings a unique and interesting experience to our event," the website says.

"As co-artistic director of Sydney Theatre Company, Cate not only helped shape the artistic vision of the company but took on a responsibility for the company to address their impact on the climate."