A rare signed Salvador Dali print is to be auctioned at London’s annual Butterfly Ball, the UK’s most exclusive charity event. Organised by Caudwell Children, the national charity that provides practical and emotional support to disabled children and their families, the Butterfly Ball receives worldwide media attention and attracts a host of A List celebrity guests. The lithograph, entitled Birth of Venus, was created by the celebrated Spanish Catalan surrealist painter in 1979 and is numbered 34 from only 150 impressions from the 1st edition.   “This is one of a number of stunning auction items that will be up for grabs at this year’s Butterfly Ball, which will once…