The closure of the Tonga parliamentary year, which was delayed by rioting in the capital last Thursday, will now take place this morning and tight security is in place in for the ceremony.
In his speech at the ceremony, Tonga's King Tupou the 5th is expected to talk about the unrest and address the question of political reform.
The security operation is being bolstered by members of the New Zealand and Australian defence forces.
The prime minister's advisor, Lopeti Senituli, says it will be brief.
"There is no discussion. It is just his Majesty making the closing speech."