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We tried a booth at a local show for a few years, but quit. Some folks there were going all out to get new work there and would spend thousands on the display and have a full crew set it up over a couple of days. We aren't that hungry, so we didn't match the effort and came off looking weak. I think if you are willing to be above average at the show you can get a good return for your time. Otherwise stay home.
Here is an idea I never got around to trying- Dump out a yard of play sand on the floor and edge it to keep it clean, then throw in a bunch of toy tractors for kids to play with. Set up a table alongside with a portfolio and some cards. No plants. No stonework. Parents would be able to let down their guard for a minute and talk. Kids would get to touch something. I imagine this would ease the selling.