A three-day model United Nations conference at University of Hyderabad will be inaugurated 5 p.m. on May 31. The inaugural, which will feature Jaiprakash Narayan and singer Leslie Lewis, will have 500 schoolchildren from 12 cities and three countries. The students will don the mantle of International diplomats and discuss a wide range of topics. The conference is an off shoot of Indian International Model United Nations, Mumbai, which is an annual event in August.