The MDMK will hold a black flag demonstration on Thursday against the visit of Sri Lankan President Mahinda Rajapaksa to take part in the valedictory of the Commonwealth Games. In a statement here, party general secretary Vaiko said Tamils were saddened by the decision of the Indian government to invite Mr. Rajapaksa, who was responsible for the killing of Tamils in Sri Lanka. The demonstration will be held near the Collectorate.