Olympic gold medallist Jessica Ennis will be at Chesterfield College later to open a new building.
The heptathelete will open a new reception and learning centre area where pupils can study, eat and socialise.
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Rain may be heavy in places but should clear to sunny intervals and scattered showers later in the day.
Rain quickly spreads from the west, turning heavy over the higher ground. Sheltered eastern spots will escape the worst of the rain.
Marcus Willis, a current club coach ranked 772 in the world, came through six qualification matches to reach this year's tournament.