The result of the Labour leadership contest will be announced at a special conference on Saturday 24 September.
The hustings period opens on Friday 22 July and runs until Friday 16 September.
A further timetable of activities will be published on Thursday.
The shadow chancellor earned loud cheers as he launched an foul-mouthed attack on the MPs seeking to replace his friend Corbyn.
The MP for Pontypridd resigned as shadow work and pensions secretary last month in protest at Jeremy Corbyn's leadership.
I now realise that my earlier description of the NEC meeting - as an omni-shambles - was generous.