In her new role, Walker replaces Tim Worton, who announced his retirement earlier this year.
The live entertainment veteran will enter 12 months’ full-time studies at Moore Theological College in Sydney.
Lazarus-Hall joins the venues group as executive vice president, entertainment & content.
Factors including inflation, rising interest rates and increased competition were at the bottom of the company’s decision to sell its facilities management business.
Both properties were previously managed by ASM.