Indeed the longest day is on June 20th. It turns out that the following bands are playing : Teenage Fannyclub, Toaster, Astrid, Speeder (is this the band or is it the club?), Ground control, Nimbus, The Bathers and Andy White. 2pm to 10pm and there's a club night in the QM later on with Andy Smith (Portishead) - this costs 8 quid though, from Fopp and Beat museum.