The message was unity. The scale was ambitious. As 500 expected guests became 700 and then eclipsed 1000, it seemed every Liberal luminary in Sydney and across the land would be there.

There was one noteworthy exception, however: Malcolm Turnbull.

Prime Minister Scott Morrison and former prime minister Tony Abbott arrive at Mr Abbott's tribute dinner. Credit:AAP

The immediate previous prime minister was flying back from his second home in New York on Thursday night while his own predecessor, Tony Abbott, entertained the massive crowd of friends and foes gathered to honour his 25 years in public life.

Among those who spoke in tribute were Prime Minister Scott Morrison, Liberal legend John Howard and 2GB broadcaster Alan Jones, who was also the event's master of ceremonies. Mr Abbott also received a lifetime service award.