I love local markets and always support the local events and the hand made items. I like plants and nature and gardening so a farmers market sounds awesome.
Try speaking to the vendors about bitcoin. Independent retailers are the easiest to get to adopt bitcoin, because there isn't all the red tape and paperwork which would be involved with a large corporation doing so. They can use a payment processor if they want, but it can be as simple as opening a wallet and providing a QR code of their address to scan. As I say, they want your business, and if something as simple as opening a bitcoin wallet will help them get it, then most will at least consider it.
Those other 4 stores accepted bitcoin without being talked into it?
Certainly not by me. But I know that once the stall I usually buy from started accepting bitcoin, a couple of other customers started paying in bitcoin, and I guess word spread from there.
You'll spend fiat anyway so convert it to bitcoin first.
Exactly. In addition to a modest amount of bitcoin earnings, whenever I'm buying or trading for some more bitcoin to add to my long-term holdings, I generally also acquire extra to be used in my day-to-day spending.