Note, those familiar with the current Splash know it is a Black celebration...
that didn't start until 1988. You can find that here:

Houston Splash

First, some photos from 1979,
and then some history

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Rick Burroughs on right

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History.....the Mentions of Galveston Splash Day I could find...

 

This is from a 1991 thesis by Robert Snellgrove
Read entire paper
He quotes Ray Hill talking about Splash Day in 1960

1966

bottom section included to show the bars at that time

1975

1977

1979

1982

1983

1984

1985

1986

1988

1989

1990

above right, first sign in TWT of Black Splash, with Tony and Cookie at Garbo's