Dr Mahathir Mohamad will address the nation tomorrow in conjunction with the Pakatan Harapan administration's first anniversary.
The prime minister's speech is scheduled to be televised live at 3.50pm on TV1, RTM radio stations and Astro Awani, among others.
Mahathir will be speaking at the Putrajaya International Convention Centre.
All top civil servants and Harapan lawmakers are expected to be present.
Ambassadors and high commissioners have also been invited.
Earlier today, preparations and rehearsals were carried out at the convention centre for tomorrow's event.
Mahathir is expected to outline Harapan's key achievements over the past year and spell out his administration's future plans.
This will be his second televised speech since Aug 17 when Harapan marked its first 100 days in power.
Meanwhile, TV1 will air a "special discussion" with Mahathir at 9.30pm tonight.
The title of the discussion is "A dynamic and clean Malaysia."