At the Sundari Royal Palace, there was a plaza at the entry to the place itself.
The plaza was located on one side of the Royal Palace, and had stairs that led up to the palace. There were several trees in rows in the plaza as well as rows of decorative pillars. There were two cubist murals of Mandalorian Crusaders fighting Jedi that faced to plaza. One was on the side of the stairs that led to the palace, while the other was on an overlooking balcony. That balcony was on the outside of the throne room, and could be used by the ruler to address the people.
In 20 BBY, Duchess Satine Kryze addressed the citizens of Sundari at this plaza after recent terrorist attacks led by unknown gangs across the city. It was also here that Death Watch leader Pre Vizsla came to address the people and win them over by promising to root out and defeat the crimials. The people gathered in the plaza to see Vizsla and Bo-Katan on the balcony at the palace above showing them the lead criminals - Lom Pyke, Ziton Moj and Savage Opress. Vizsla was declared to be the new Prime Minister of Mandalore.
Shortly after, the people gathered when Vizsla and Bo-Katan presented the imprisoned Sith Lord Darth Maul. Sometime after that, Almec appeared to the people in the plaza and said that Satine Kryze - now imprisoned as he had said to the people - had murdered Vizsla, who wished for Almec to be the Prime Minister.
Soon after, the Dark Lord of the Sith Darth Sidious dueled Darth Maul and Savage Opress at this plaza after he and the two brothers fell off a balcony at the palace itself. It was here that the Dark Lord impaled Opress, killing him.