Fred Weasley took Angelina Johnston, but it is unknown who George Weasley took.
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Cedric Diggory and Cho Chang dance together in the fourth movie, Harry Potter and the Goblet of Fire. They attend the Yule Ball together.
Neville longbottoms date to the Yule Ball was Ginny Weasley
It is known that during Goblet of Fire, Cho Chang and Cedric Diggory date. They attended the Yule Ball together and during Order of the Pheonix Cho mentions how she'd been dating Cedric and they'd once went on a date the Madam Puddifoot's coffee shop in Hogsmeade. Madam Puddifoots is often filled with kissing couples so one can guess Cho and Cedric might have kissed there aswel, or some other time as they very muich loved each other. During the Triwizard Tournament's second task Cho was taken hostage as the ting Cedric would miss most. Though it never mentions them kissing, it also doesn't say they didn't. However in Order of the Pheonix we witness Cho kissing Harry after Cedric's death.
The Yule Ball is held on the eveninng of Christmas Day in a year of a Triwizard Tournament. The ball begins at 8:00 p.m. and ends at midnight. source: http://harrypotter.wikia.com/wiki/Yule_Ball
Luna's character does not appear until the fifth book, the Yule Ball was in the fourth. She would also have been to young to attend unless an older student asked her. Considering her reaction to Harry asking her to Slughorn's party in the sixth one she probably didn't attend.