Four acts have already been confirmed for this year’s London Eurovision Party, known as one of the two major pre-Eurovision events for this year’s participants. Mélanie René (Switzerland), Giannis Karagiannis (Cyprus) and Marta Jandová and Václav Noid Bárta (Czech Republic) will all be performing at the event in London, with special guest Sarbel (Greece 2007) joining them on the line-up. …