I no longer wrestle at any sort of sing or hoot, Barry.   I have had complaints that the inevitable wagering distracts from the singing.

In any case, I never need either a songbook or crib sheets at sings, owing to an annoying trick my brother and I used to do as kids, which is to watch someone's lips and talk(or sing) along with them.

I one day I got a whole band angry at me at a free concert because they thought someone must have stolen tapes of their never completed album and given them to me. That is another story though.

I agree with Joe that this is about all the things that are involved in making a music gathering work--and, books or no, it takes a lot of work to make these seemingly spontaneous events happen!