Black Box theatre, GalwayMichael Keegan-Dolan charts how he found his creative voice alongside longtime collaborator Rachel Poirier A dancer drags a bag of compost on to the stage and hacks it open with intent. This is not quite a staged memoir from choreographer Michael Keegan-Dolan, more an excavation of his roots. As in his dance theatre works such as Giselle, The Bull, Swan Lake and MÃM, Keegan-Dolan here uses…