A group of artists under the name The Good Crude Britannia was voicing its concerns as Tate Britain held its summer party.
The event was organised jointly to launch a major new display by artist Fiona Banner and 20 years of support by BP.
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Hide AdFigures such as playwright Caryl Churchill, cartoonist Martin Rowson and comedian and writer Rob Newman are among dozens of figures who have put their names to a letter protesting about the association.
They claimed the "BP logo represents a stain on Tate's international reputation".
But Tate defended its tie-up with the oil company and said BP was "one of the most important sponsors of the arts in the UK".