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.
Shadow foreign secretary has not yet secured the 22 nominations necessary.
But the one concrete outcome could be a much stronger shadow frontbench.