blockon.
/ˈblɒkəʊ/, U.S. /ˈblɑkoʊ/, Caribbean English /ˈblɑkoː/ Caribbean (Grenada, Trinidad, and Tobago).
A large outdoor party held by the residents of a block or neighbourhood, esp. one at which steel bands, DJs, etc., perform.
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society > leisure > social event > social gathering > party > [noun] > other parties
play-party1796
tail1837
surprise-party1840
street party1845
costume party1850
pound party1869
all-nighter1870
neighbourhood party1870
simcha1874
ceilidh1875
studio party1875
pounding1883
house party1885
private function1888
shower1893
kitchen shower1896
kitchen evening1902
bottle party1903
pyjama party1910
block party1919
house party1923
after-party1943
slumber party1949
office party1950
freeload1952
hukilau1954
BYOB1959
pot party1959
bush party1962
BYO1965
wrap party1978
bop1982
warehouse party1988
rave1989
1975 Mas Parade (Key Caribbean Publ.) 15/1 One big fete, really. Or, if you like, the biggest of ‘blockos’ (blockoramas).
1995 S. Stuempfle Steelband Movement v. 213 Steelbands first began holding blocos in the late 1960s; by the mid-1970s there were blocos virtually every weekend of the year.
2020 @DjDevie 3 Jan. in twitter.com (accessed 22 July 2021) This reminds me of when Lyle Anthony Henry yard lime in Parforce turned into a blocko. Dance we ah dance!!!!
This is a new entry (OED Third Edition, December 2022).
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n.1975