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splash party
splash party n.
Brit. 
/ˈsplaʃ ˌpɑːti/
, /ˈsplaʃ ˌpɑːti/U.S. /ˈsplæʃ ˌpɑrdi/
U.S. a party at which the guests engage in swimming and other water sports./ˈsplæʃ ˌpɑrdi/ΘΚΠ
society > leisure > social event > social gathering > party > [noun] > bathing party
pool party1913
splash party1930
1930 Amer. Speech 6 121 Splash.., swimming: Splash Party of Girls' Club Lively Affair.
1956 W. H. Whyte Organization Man xxii. 291 ‘Splash’ parties (all you can eat for a dollar).
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