A family ticket, including two grandstand and paddock tickets, two ice creams and a Union Jack picnic blanket, is available for just £30 if booked by Friday (June 1).
The team at Fontwell Park Racecourse is counting down to a jubilee raceday celebration on Sunday, June 3.
More than 6,000 people are expected to join in the fun.
As well as seven races, there will be free family entertainment, funfair rides, inflatables and face painting.
Picnickers will be welcomed in the centre course, to take part in The Big Lunch.
The Thames Flotilla Pageant will also be shown on the Big Screens between racing and children under 16 go free.
The offer can be booked by calling 01243 543335 and quoting SN3612.