Best is to bring it to the jam, and then see how it goes. If it is a no sheet music jam, don't take it out, if it is a sheet music jam, your prepared.
There was a bluegrass jam in the DC area that was held it two parts. A so called slow jam for an hour, a break, and then two hours of a regular jam. During the first hour someone would hand out chord sheets to help folks. Those who had the chord sheet from the week before took it out of their binder. In the regular 'after the break' jam, the newbies were welcome to stay, and about half did, and kept their music "cheat sheet" in view.
And how many bluegrass jams have one or two huge three ring binders with song lyrics and chords. They are used not just to aid the newbies, but to remind the core players what other tunes they might do, and to keep everyone on the same page.
But the fundamental advice is sound, see what kind of jam it is and comply. If it is not a jam with cheat sheets, don't cheat.
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