We certainly don’t ban ringbinders and tablets, etc at my club, although I would hope that they might take the hint by the way I carefully move music stands to the side after such performances. As someone suggested above here, the more they are tolerated the more that people think it is the norm, and for many teenage strummers playing in our pubs here now, it sadly is, with Mum and Dad nearby to turn the pages for them. But don’t get me started on that.....