Another one nearby is in Denton, on the courthouse square, Saturday mornings from 10:00 until noon or later. When the weather is nice there are usually enough folks to have several jams going at once- generally one group doing old "cry-in-your-beer" country, another doing more old-time instrumentals, etc.. There's also a jam in the little town of Ponder, north of Ft.Worth, on the first Sunday of each month at the Ranchman's Cafe. (You can't miss it, it's the only thing open in Ponder on Sunday afternoon. Usually bluegrass flavored, but open to whatever.