You circle the entire market before you commit to anything. Everybody does it, nobody was told to, and the reason is simple: the stall two tents down might be the one you think about all week.
What separates this from a food hall is that the competition is visible. Dozens of vendors under canopy, all within sight of each other, all watching where the line forms. You end up trying things you would never order off a menu, partly because the plate is right there and partly because the person who made it is watching your face take the first bite. The roster turns over as people rise or fold, which makes a Sunday here the first month of a restaurant's life, compressed into one block and fifty simultaneous experiments.
Sundays at ROW DTLA, south of the Arts District, free to walk in. Go hungry, go early, and do not commit on the first lap.