with the setup and takedown time , plus travel time , for the sales made, it's not even worth going in most cases..
Here's how it would go for me when I did shows:
Go to the bank for change in case I have luddites wanting to pay with cash.
Inspect everything (dust, finish, cracks, correct prices, etc).
Make sure Square, Paypal, Venmo are working on my phone, hope there's decent signal or wifi at the venue.
Unpack tables etc from the shed, shlep it all around to the truck, load it up.
Box up product, load it up.
Drive.
Unpack tables etc. Oh, the product boxes are on top of the tables... rearrange in the parking lot.
Shlep tables into the venue.
Setup tables etc.
Shlep boxes in, unpack, setup.
Hide boxes, dolly, etc or shlep em back to the truck.
Hopefully sell some stuff.
Retrieve boxes, etc.
Repack product.
Shlep boxes to the truck.
Fold up tables etc, shlep out to truck.
Ugh. Can't put the tables on top of product boxes, so reorganize again in the parking lot.
Drive home.
Unload boxes back to the house.
Unload tables and shlep them around to the shed.
Throw table cloths into washer, store them later.
Take checks and leftover cash to the bank.
Mess with the stupid form(s) for state/local sales tax.