Mr Turner's father Mark said his son felt "let down" by the UK government
About 100 people attended a candlelight vigil in aid of two men extradited to Hungary after being accused of fraud.
Family and friends of Michael Turner, of Corfe Castle, Dorset, gathered in The Square to pray alongside the village's vicar Revered Ian Jackson.
Mr Turner, 27, and his business partner Jason McGoldrick are in jail accused of fraud following the collapse of their Budapest marketing company.
Mr Turner flew to Hungary after being extradited but has not been charged.
His family and supporters have held demonstrations outside the House of Commons and the Hungarian embassy, protesting against his treatment in prison.
Mr Turner's father Mark also met with South Dorset Labour MP Jim Knight where he handed in letters addressed to Europe Minister Baroness Kinnock and Home Secretary Alan Johnson.
The letters asked for the immediate release and repatriation of both men.
Mr Turner's father said that his son felt "let down" by the UK government.
The men's problems began when their Budapest-based company collapsed with debts of £18,000.
The Hungarian authorities allege the company's creditors are victims of fraud.