Folkies' do

• Musical wingding
• Informal folk-singing performance
• Gathering where folk music gets played
• Party involving folk music

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
hootenanny \hoot"en*an*ny\ n. An informal social gathering or concert featuring mostly folk songs, sometimes dancing, and where the audience often participates in the singing. [PJC] Same as whatchamacallit ; a thingumbob. [Obsolescent, chiefly dial.]

Wikipedia Word definitions in Wikipedia
Hootenanny was an American musical variety television show broadcast on ABC from April 1963 to September 1964. The program was hosted by Jack Linkletter . It primarily featured pop-oriented folk music acts, including The Journeymen , The Limeliters , the ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"informal session of folk musicians," 1940, American English, earlier "a gadget" (1927), of unknown origin, perhaps a nonsense word.\n\nAnother device used by the professional car thief, and one recently developed to perfection, according to a large Chicago ...