I have been the last two years, and plan to be there again this month. Never having been to the parent event at Deep River I can't compare them. There have been lots of vendors both years, pretty much filling two big tents.
Targets are good, as DGM said. Not soft as charity shoots but not as tough as big registered shoots. There are the most nice doubles I ever get to see in one place for sale.
The reason it is held in October is, most likely, comfort of the attendees. Those of us who live here kinda get used to the heat and humidity, (and bugs), but they're tough on others not used to such weather. It is a bummer that it falls during hunting season, but I have not regretted giving up a few days hunting to attend.
SRH