The oldtime slow jam will take place every second and fourth Sunday @ Brooklyn Rod & Gun Club. The jam will have three leaders on banjo, guitar and fiddle who will be there from 6-7:30pm.  Promptly at 7:30 a free performance will occur from an established musician in the area and everyone is encouraged to stay and imbibe at the wonderful social club-but of course, you don't have to!  There usually isn't food, although the grill sometimes is out during the summertime. Brooklyn R & G club is locat …