The VW Show due to take place on Sunday at Berkeley Castle in Gloucestershire has been cancelled due to the bad weather. Organisers say the field is waterlogged.
They say a new date will be set for next year in due course. All exhibits and stalls will be valid for the new date.
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Stephen Gilbert who was the constituency's MP from 2010-15 will contest the St Austell & Newquay seat for the Liberal Democrats on 8 June.
It'll be dry and sunny to begin with this Bank Holiday weekend in the West, but with showers just around the corner.
It's a mixed weekend for the South West ahead with sunshine on Saturday but rain and showers across Sunday and Monday.