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I understand that the 'employer' could cover themselves for the non appearance of an artist, in this case the singer in question has been contracted to sing at a wedding abroad. the contract, I believe says that if they cancel they are due to pay her compensation, if she cancels she has to pay them compensation. as they are paying her travel and accommodation expenses as part of the deal, she would be due to repay these. I guess her usual travel policy would cover her for the cancellation element of the travel and accommodation, it was the compensation element of the contract she is unsure about. I admit I have not read this contract and need to have a proper look at it. she is quite young and is just starting out on her singing career so hasn't been in this position before, usually she just sings at local pubs where there isn't any entrance charge so if she is ill she simply doesn't perform.