Koizumi comes to DC

Tomorrow, Japanese Prime Minister Junichiro Koizumi arrives in DC. It seems the he will occupy the DC schedule from 9am to 9:50pm, all day long. Take a look,

9 a.m.: Pres. Bush with Mrs. Bush, welcomes Japanese Prime Minister Junichiro Koizumi to the White House.
9:50 a.m.: Holds Oval Office meeting with Prime Minister Koizumi.
11:50 a.m.: Holds a joint press availability with Prime Minister Koizumi.
7 p.m.: With Mrs. Bush, greets Prime Minister Koizumi.
7:20 p.m.: With Mrs. Bush and Prime Minister Koizumi, holds a photo opportunity. White House,
8:05 p.m.: With Mrs. Bush, hosts official dinner with Prime Minister Koizumi. White House, State Dining Room.
9:50 p.m.: With Mrs. Bush, attends entertainment in the East Room.

I have two questions, one, why it is a Official dinner, instead of a state dinner, who official it is? Two, which kind of entertainment is going to be? American Bluegrass?