Waiting for May, EU pencils April 6-7 Brexit summit

By Francesco Guarascio and Alastair MacdonaldBRUSSELS (Reuters) - European Union leaders have been told to be ready for a Brexit summit at the end of the first week of April, EU sources said on Wednesday, although the final date will depend on British Prime Minister Theresa May.A summit of the other 27 national leaders to respond to May's formal notification of Britain's departure appears in an internal EU calendar seen by Reuters on Thursday, April 6, "to be confirmed".An EU source said summit