Sydney’s original 2UE 954 this Australia Day Monday will celebrate its 90th birthday with a live outside broadcastfrom Queens Square on Macquarie street in the CBD.

The special event marks 90 years since Australia Day 1925 when the on-switch was flicked at the country’s first commercial radio station: 2UE.

The nine-hour outside broadcast features special guests including Gary O’Callaghan, who was a host with the station for more than 50 years; a performance by John Williamson; plenty of Aussie themed food; prizes; and, of course, a 90th birthday cake.

Past and present staff and listeners are invited to join the festivities, with 120 live audience seats available – first in, best dressed.

The party starts at 5am with John Stanley, Garry Linnell, Stuart Bocking and Angela Catterns.

From 8-9am the legendary Gary O’Callaghan returns to the 2UE airwaves, joining John and Garry to re-live the memories, stars, and past and present moments that make 2UE great.

At 10am Stuart Bocking and Gary O’Callaghan will cut the special 90th birthday cake, with 90th birthday-branded cupcakes served to the audience at the same time.

Straight after the cake cutting, special musical guest John Williamson will perform some of his greatest hits.

2UE content director Clinton Maynard paid particular tribute to special guest Gary O’Callaghan, he said: “For nine decades 2UE has inspired listeners.”