The poster for the event, which depicts transgender model Carmen Carrera nude, as both a man and a woman, has already sparked controversy in the city and become a hot topic of conversation.
The right-wing Freedom Party (FPÖ) has filed an official complaint, as has a Viennese lawyer “in the name of 32 concerned parents”.
“The poster is a danger to young people and is widely visible as it is located near to schools, churches and public transport,” his statement says.
Austria’s star of the moment, Eurovision winner Conchita Wurst will sing her song Rise Like a Phoenix on the Life Ball’s main stage in front of City Hall.
This year’s fashion show, part of the ball’s opening ceremony, is designed by Vogue Italia boss Franca Sozzani. Each year, the opening ceremony attracts tens of thousands of visitors, and guests are encouraged to wear quirky and unusual outfits.
The Life Ball is the biggest annual charity event in Europe supporting people with HIV or AIDS.
In Austria, around 6,000 people are currently receiving medical treatment for HIV.
This year the Life Ball Crystal of Hope Award, endowed with €10,000 donated by Swarovski, will be awarded to the Kenyan Safe Water and AIDS Project, which provides hygienic conditions for people living with HIV.
The Life Ball will be broadcast live on ORF television, and The Local Austria will also be covering the event.