I've also figured out how to quickly prepare for a market session a day in advance; then on the day of, it's a simple as loading the car and going. Overall, I'm fully ready to hit the road and visit other settings. I've also got the OB Farmers' Market down, and will be able to fall back on it as necessary.
Here's the short list of stuff required to booth it up:
-clothing rack
-canopy
-portable table
-fold-up chair
-4 bins of shirt inventory
-1 bin of accessories:
--display shirts and their hangers
--tupperware drawer:
---clipboard with email list sign-up sheets
---stickers
---pens
---receipt book
---laminated signs featuring catalog and prices
---double-sided tape
---shopping bags
and last but not least, it's nice to bring refreshments and to have a little audio support, too: