History of ballet
Ballet originated in the Renaissance court as an outgrowth of court pageantry in Italy, where aristocratic weddings were lavish celebrations. Tutus, ballet slippers and pointe work were not yet used. The choreography was adapted from court dance steps. Performers dressed in fashions of the times. For women that meant formal gowns that covered their legs to the ankle. Early ballet was participatory, with the audience joining the dance towards the end.
International Ballet
1951 was the year of the Festival of Britain and the opening of the newly built Royal Festival Hall on the South Bank, and International Ballet was invited to present a programme of ballet for its inaugural season. 
The Festival Hall is principally a concert hall and has no proscenium arch or stage curtains. Temporary ones could have been erected, but International Ballet decided to present their ballets without them. Special lighting had to be devised, and new sets designed to complement the unusual lighting. The varied programme included the two Massine ballets and the Russian classical ballets, but they had to be adapted somewhat to suit the new stage arrangement. This novel presentation of ballet attracted criticism from some quarters, but all performances of the long summer season were sold out.
The company was invited to do another season the following year but could not accept because of prior commitments overseas. However it had shown that ballet could be successful staged this way, and some time later the Festival Ballet made the Royal Festival Hall their London base.