I have done craft shows. It is like rolling dice, sometimes you go bust and are way out of pocket, other times you make just enough to cover your expenses. Sometimes you can make enough to make minimum wage for your time. The persons who do well are regulars, they build a following who show up every year to buy from them.
The trick to craft shows is to have some WOW factor items on display to draw people in and then the primary quantity of things you make need to be selling for under $35.00 because that is the impulse buy cut-off for the majority of buyers. Those items are what covers your booth rental expenses so that you while you might not have a really good profit making day you have not gone completely bust. Because those items tend to be quite small take some high res photos and have them blown up to put on a display banner for a big graphic to draw people in. You can get durable graphics printed onto material that is weather resistant and can be stored rolled up to a compact size. A graphic sign shop business either local or internet based can produce that for you.
Remember that van dweller theory, that you should make the things you carry have multiple uses?
I will be doing some silver soldering and metal annealing of small objects while on the road using a small, refillable, butane torch. You can take a camp stove that has side shields, disconnect the gas supply, open the lid, set one of the lightweight solder blocks over the burner area such as the one in this link.
https://www.ebay.com/itm/12-x-12-No...144346?hash=item4b4b7ebd1a:g:RyUAAOSwfopbbJlW
That way you have metal shielding on three sides as well as the metal box underneath. That makes it a low risk situation to do some annealing and silver soldering with a small, refillable, butane torch. Just don't aim the torch up at the ceiling! Leave the door and windows open to remove fumes if you have to work inside due to burn bans. Helps if you have one of the ceiling fans that move a lot of air such as a Fantastic Fan.