Around 30 private gardens and courtyards are set to open this summer as part of the Eye Open Gardens Festival.
The historic market town, renowned for its architecture, will host the annual event on June 10-11.
This year, celebrity talks, music, teas and free rides around the houses in a 1949 Bristol red and cream bus, will be available.
Jonathan and Tom, the Scott brothers, will be performing with a backdrop of animation in the parish church on June 10.
Nick Robinson, presenter of Radio 4's Today Programme, will be there on June 11, followed by Lady Jane Wellesley talking about her ancestor, Wellington the Iron Duke.
Last year, the festival raised £5,000 for the parish church.
Sponsor, Simon Harrison, director of Harrison Edge, said: 'Not only is it a feast for gardeners, but it enables all visitors to enjoy the many secret spaces behind the historic buildings.'
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