Han Dold City is a far from harmless city on an unspecified planet, where warring police tribes lay ambushes for one another, bass players get machine-gunned for playing the wrong riff too many times, and call girls with degrees in sociology tell wealthy record company executives that it's actually okay for them to be rich.
The Old Pink Dog Bar is a far from harmless bar in Han Dold City where Ford Prefect discovers that Earth was not as demolished as he previously believed. It was also here that Ford almost lost his breathing privileges after attempting to pay an extensive bar tab with an American Express card, before as a last resort he offered a write-up in the Hitchhiker's Guide.
Han Dold City is mentioned in So Long, and Thanks for All the Fish. The name may be a play on 'handled' and/or 'old hand', depending which explanations are believed.