Hindu organisations from various parts of the country and abroad will demand a nationwide ban on consumption of beef at the four-day convention scheduled at Ramnathi village in Goa on June 14, a Hindu Janjagruti Samiti functionary said on Saturday. HJS leader Charudatt Pingle announced that more than 400 delegates representing over 150 Hindu organisations from across the country, and also from Nepal, Sri lanka and Bangladesh will attend the sixth Hindu convention being organised by the HJS.