You have it more or less right but more less than more because there's officially no such place as "Sunnee Plaza"; it's called "Marina Plaza" for many years.
For some reason Mme Sunnee wished to distance herself from the place when she went politics.
So to sum up; Joe's birthday party (1st phase) will be held on the evening of January 9th 2018 in a bar that's sometimes called Sunnee Plaza Bar though there's no such place as Sunnee Plaza, but more often called The Green Chairs Bar, though there are no green chairs in the place now.
Easy as a walk in the Park.