Perhaps you are thinking of:
* "Poplar Walk" as a real place: There are several real locations in London named "Poplar Walk" but it's unlikely Dickens wrote about a dinner party specifically at any of them.
* A similar event in a Dickens novel: It's possible you're remembering a dinner party scene from a Dickens book but misremembering the location. Maybe it was a grand banquet in "A Tale of Two Cities" or a more humble gathering in "Oliver Twist."
If you could provide more details, like:
* The book or story you're thinking of
* The characters attending the dinner
* Any other events that happened during the dinner
I might be able to help you pinpoint the specific dinner you're looking for.