Artist Tomas Georgeson says he's left a cheque for £8,000 in Milton Keynes Gallery in the hope it will attract more visitors.
He has placed an advert in the local newspaper, The Milton Keynes Citizen, which reads: "A blank cheque for £8,000 has been hidden somewhere in the public spaces of Milton Keynes Gallery. It will be collected on 1 March 2013 if unclaimed."
Mr Georgeson said he wanted to get people through the door and change the mood of the place.
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The Met Office has issued a yellow weather warning for the risk of snow and ice in parts of the Anglia region on Sunday night into Monday.
Touts for unlicensed punt operators could soon be banned from parts of Cambridge.
A few wintry showers are possible during the evening, but most places clear with frost developing.