Audi and Lexus will display cars at the Salon Prive event in London for the first time this year.
They will join Jaguar, Rolls-Royce, Aston Martin and Maserati, which have already confirmed they will attend.
The event, which is in its fifth year, will once again be held at London's Hurlingham club.
Jaguar will be the main draw, as it will display a range of cars celebrating its 75th anniversary.
The event runs from 21-23 July.
Full hospitality daytime tickets cost £175.00 (Wednesday) and £150.00 (Thursday and Friday) per person. The price includes lunch, champagne, a complimentary bar and afternoon tea.