The man died just days later after making the three hour journey from Bronglais Hospital in Aberystwyth to Singleton Hospital in Swansea with no medical attention.
The nurse is accused of not carrying out an 'adequate assessment' of the patient and of making a 'retrospective entry' in his medical records a year after he died.
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The three day annual event, held this year at Caerphilly castle is expected to attract thousands of visitors.
Dramatic footage of a near escape on the train tracks has been issued as part of the latest rail safety campaign
A mixture of cloud and bright spells for Bank Holiday Monday, remaining cloudy this afternoon