An outdoor and socially distanced opera is taking place at Stage@TheDock on Hull Marina in September. Hansel and Gretel, from Whistle Stop Opera, will retell the fairy tale of two hungry children, lost in the woods, and a gingerbread cottage that hides a scary secret. Devised by John Savournin for four singers and accordion, social distancing will be in place for audience members and performers, and a limited number of tickets will be on sale in accordance…