Monday Club
/ˈmʌndeɪ ˌklʌb/ /ˈmʌndi ˌklʌb/noun
The name of any of various clubs which originally met on Mondays; specifically (a) US a literary or political discussion club (now historical ); (b) British Polit. a right-wing Conservative club formed in 1961.
Origin
Mid 19th century; earliest use found in Harper's Magazine. From Monday + club.