FreddyHeadey - I can't find any history on Maidenhead's FC website or anywhere else. The only reference to a date is a post above by RJM 26 Jul 23 - 04:45 PM - Maidenhead, 1965?   
I searched for "maidenhead 2015" & found an article about the Nettlebed Folk Song Club turning 40 that year, (it was started in July 1975 by a group of folk song lovers from Maidenhead when the tenant of a local public house moved to the Bull Inn at Nettlebed) so I've added it to the list.
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thanks & GUEST & guest

San Francisco Folk Music Club (US) - founded 1948
Bush Music Club (Aus) - founded 1954
Topic in Bradford (UK) - founded 1956
Bridge Folk Club Newcastle (UK) - 1958
Edinburgh University Folk Society (UK) - April 1958
Vancouver Folk Song Society (Can) - July 1959
The Folksong Society of Greater Boston (US) - 1959
Victorian Folk Music Club (Aus) - 1959
Swindon Folk Club (UK) - Jan 1960
Dunfermline Folk Club (UK) - 1961
Stockton Folk Club (UK) - 1962
Aberdeen Folk Club (UK) - 1962
Birtley Folk Club (UK) - 1962 & closed December 2014
Herga (UK) - 1963
The Fo'c's'le (formerly Balladeer) Southampton (UK) - 1963
Marsden Folk Club (UK)- 1963
The Pick'n & Sing'n Gather'n (US) - 1960s
Grimsby Folk Club (UK) - 1964
Folklore Society Of Greater Washington (US) - 1964
Black Diamond Folk Club, Birmingham (UK) - 1964
Cambridge Folk Club (UK) - 1964
Southport's Bothy Folksong Club (UK) - 1965
Orpington Folk Club (UK) - 1965
Whitby (UK) - similar age to Orpington
Cutty Wren Folk Club, Redcar (UK) - 1965
Folk at the Royal Oak, Lewes (UK) - 1965
Yellow Door, Montreal (Can) - 1966
Croydon Folk Club (UK) - 1967
BACCApipes Folk Club (UK) - 1967
Frodsham Folk Club (Cheshire UK) - Jan 1968
Christchurch Folk Club (formerly Bank Peninsula Folk Club) (NZ) - est. Nov 1968
Central Australian Folk Society in Alice Springs (Aus) - est. 1968
Dragon Folk Club (Bristol, UK) - 1969
Durham City Folk Club (UK) - 1969
Fleetwood (UK) - 1969 (40 slightly interrupted years)
Hoy at Anchor - 1970
Devonport Folk Club (NZ) aka The Bunker - 1970
Chichester Folk Song Club (UK) - over 50 years (as of 2023)
Top End Folk Club (Aus) - est 1971
Calgary Folk Club (Can) - 1972
Islington Folk Club (UK) - 1972
Woods Hole Folk Music Society (US) - 1973 final concert May 2019, Society is still in existence
Nettlebed Folk Song Club (UK) - 1975
Dorking Folk Club (UK) - 1976
Llantrisant Folk Club (UK) - 1980