Artsfest is here - Oodles of FREE gigs, outdoors and in, all sorts of music including stuff like ballet even. http://www.artsfest.org.uk/
And, there's a big Project X event at BUSK, http://www.projectxpresents.com/next-project/ which includes Buzz Boxes: "The sound can be controlled by the user with a knob or a sound hole to manipulate or vibrate the noise that emerges from a tiny speaker inside. Each box has an output for amplification." Oo'er.
Full gig list here:
(Click on day and then click on artist name to hear their music before you go to the gig.)