Looking for advice on a specific situation encountered at probably every county fair. Is there a way to help/aide/increase water flow/pressure for a line (series) of spigots like you find in outdoor washrack areas without busting up concrete and replacing supply lines? Is there a way to extend past last spigot, or loop lines, so that water flow has an equal path for say 4 outlets, 6 outlets? Thanks for any info you can share!

You have the right idea but it depends on how the present install is made. Just put a tee at the last fixture and return the line to before the tee at the first fixture. That should equalize the pressure and distribution.

that is the best advice. but if that is too impractical then can you feed the last faucet first ?

You can distribute what you have, evenly, by adding globe valves before each spigot. It will require some fiddling with the adjustments to balance things. If there isn't enough flow, then you might consider adding a constant pressure booster pump.

All that would do would be to reverse the sequence of low pressure. IF there is not enough pressure/volume at the first faucet, there is nothing you can do piping wise, to change things without major expense.