Maya Soetoro-Ng, sister of Democratic presidential nominee Barack Obama, will make an appearance on behalf of her brother at the Big Island Democratic Party's Grand Rally tomorrow in Mo'oheau Park.

Soetoro-Ng is expected to arrive at approximately 6 p.m., Obama campaign officials said.

Soetoro-Ng also will attend the Democratic Party of Hawaii's Unity Breakfast at 7:30 a.m. Sunday at the Ala Moana Hotel in Honolulu.