deipnosophist

From Dictionary.com

deipnosophist \dyp-NOS-uh-fist\, noun:
Someone who is skilled in table talk.

At the age of six his future as a deipnosophist seemed certain. Guzzling filched apples he loved to prattle. Hogging the pie he invariably piped up and rattled on.
-- Ellis Sharp, "The Bloating of Nellcock"

Deipnosophist comes from the title of a work written by the Greek Athenaeus in about 228 AD, Deipnosophistai, in which a number of wise men sit at a dinner table and discuss a wide range of topics. It is derived from deipnon, "dinner" + sophistas, "a clever or wise man."

From Quinduno's Quotes:

"There are no deipnosophists at a Thanksgiving table."