Anguished over disruptions in the working of the Rajya Sabha, Chairman M Venkaiah Naidu on Monday cancelled a dinner he was to host for members of the Upper House on Wednesday. According to sources, preparations for the dinner were completed last week. Naidu had even spoken to the President, the Prime Minister, the leader of the house, the leader of opposition and floor leaders of various parties whom he had invited. Invitation cards were kept ready. Naidu had expected the House proceedings would normalise by today.