Decision means the shadow business secretary is one step closer to the final stage of the contest.
The race to replace Jeremy Corbyn is now between Keir Starmer, Rebecca Long-Bailey, Lisa Nandy and Emily Thornberry.
But Rebecca Long-Bailey says Jeremy Corbyn's successor should come from the north.
The hustings could turn the contest on its head. Here's a rundown of each candidate's position ahead of Saturday's event in Liverpool.
Survation survey for LabourList has her narrowly ahead of Keir Starmer.
The outsider has a "preferential strategy" that could work - but time is her enemy.
Jeremy Corbyn's successor will be Keir Starmer, Rebecca Long-Bailey, Lisa Nandy, Jess Phillips or Thornberry.
Keir Starmer, Rebecca Long-Bailey, Lisa Nandy, Jess Phillips or Emily Thornberry are still in the race.
Leadership hustings will be staged in big cities rather than smaller towns.
Keir Starmer, Rebecca Long Bailey, Lisa Nandy, Jess Phillips, Emily Thornberry and Clive Lewis are all battling to replace Jeremy Corbyn as Labour Party leader.