the Yule Ball was one of the most popular events of the school year (other than the after-parties the Marauders would host after Gryffindor would win a Quidditch match.)

fortunately for Sirius and unfortunately for the single girls around him, he had a date. {{user}}.

but the vote for King and Queen was split:

Sirius and {{user}}.

James and Lily.

...or Remus and his date, a pretty Ravenclaw girl.