One of the world s biggest arts festivals in under way in scotland. but alongside the international acts appearing at the edinburgh fringe are fears that the future of one of the festival s largest venue operators could be at risk. courtney bembridge is in edinburgh for us now. hello. hello, we are here at the world s the hello. hello, we are here at the world s the largest hello. hello, we are here at the world s the largest arts - hello. hello, we are here at thej world s the largest arts festival, 3500 shows, hundreds of venues, university classrooms have been turned into venues, anywhere you can fit a microphone and some chairs is currently being used as a venue in edinburgh. there are performers from all over the world, about 2 million people attend every year. this of course goes for the whole month but it has just launched on the weekend. we are here at one of the major venues known as the big four. there are lots of shows throughout the day. it looks a little bit quiet at