Anyone know anything about it?

I'm trying to book someone for a London show, his Uk label has told me I could book it in June as he's thinking of coming over to the UK then, they said he's playing at this show called Diogens but didn't seem to know much about it. I can't really find it on the internet bar maybe a breif mention on the Incus label site. Obviously if he's playing in London I wouldn't like to book him to do another show in London in the same week so if anyone had a clue about this festival or show that be great. thanks.