Rhythmism.com

93 Feet East, Brick Lane, free before 11, £5 after, 8pm - 1am

Breakbeat scallywags DJ DEEKLINE and OLLYWOOD roll up to flex some serious muscle, promoting the launch of their new album, "BREAKS, BEATS & BLONDES". These power-lifting breakbeat beefcakes bring miami bass through to new electro flavuuurrrs - and they can cut-and-scratch with the best, setting the scene for a turntable showdown with wrist-flicker NICKY FATBACK: Finally we'll know who spent most time alone in their bedroom as a child... Bring it.
TOAST's cut-and-scratch favourites NICKY FATBACK & LOCAL HERO
Breaking beats and necks RAT RECORDS honchos, DJ DEEKLINE & OLLYWOOD

how often does this event happen?

Events like this happen randomly, no regular time I think.

For regular free breaks Rennie Pilgrim's Hum party starts up again on 10th July at Canvas. You have to sign up on the net to get guest list:

http://www.leylinepromotions.com/hum/