Parkway’s ‘monster’ Thanksgiving po-boy for a good cause is back. Here’s when, how to get one.

The Thanksgiving sandwich has become almost as common as pumpkin spice this time of year, with big brands now heavily promoting their own renditions.

But the Thanksgiving turkey po-boy from Parkway Bakery & Tavern is something different, a phenomenon in its own right that has been harnessed for a good cause by two New Orleans restaurant families…