FRIDAY: >>Do you like Hall and Oates and Haddaway? Who doesn’t? The Black Cat is hosting Crap, a dance night of bad music on purpose. We advise loosening your Macarena muscles and preparing your ears for “singers” like Don Johnson, Eddie Murphy, and Bruce Willis. 10 pm, free. SATURDAY: >>There are more art openings than we can shake a sculpture at today, so check out our Arts Agenda for a rundown. >>Anything called “Underwear Party”…

The XYZ Affair will be at the Black Cat Backstage Sunday night. With the Teeth and the High Strung. $10. Is the XYZ Affair’s first proper full-length, A Few More Published Studies, a concept album about academia? If so, it’s anything but bookish. Give the band points for originality — quoting F. Scott Fitzgerald and echoing Queen isn’t exactly a natural combination — but give them more points for ambition, because this album is a…