"Wading Through the World’s Biggest Vinyl Market in Utrecht" Tue Apr 25th Unable to show videos. Please click here to accept cookies and enable embedding of videos. Read Outpost Magazine's experiences of the Mega Record & CD Fair. The Biggest Record Fair in the World returns to Utrecht during Le Guess Who? 2017, taking place November 11 & 12. Internationally renowned, the event houses 500+ record dealing stands across 12.500 square meters of floor space and has become an unmissable cult event for music lovers.