according to the 1954 definition of folk it is not ok to use a song book, nor is it ok to wear anything but blue jeans and a flannel shirt.   Hats are allow but as long as they are not newer than the 1930's style. No electric of any type, even mikes ... If one needs to enhance the performance so people in the back can hear it is recommended that the performer sing inside a barrel so the sound will echo

Alcohol is allowed but if it is hard alcohol it cannot be scotch, moonshine is preferred but bourbon is acceptable

Now any foreign brands of guitars is not allowed, they must be american or canada made. None of these China made brands since the guitar did not exist in china prior to the 1950's.

audience, hay bails for chairs is the only thing authorized to sit on. Anything else and one must stand through the performance

Jokes are permitted as long as they include the line, a farmer had a daughter and a travelling salesman came a calling one day ...

I will enlighten you with the rest as soon as I dig out the rules