Stephen Adler of the Institute for Advanced Study, in Princeton, New Jersey (USA), who shared the 1998 ICTP Dirac Medal with Roman Jackiw of the Massachusetts Institute of Technology in Cambridge, Massachusetts (USA), will deliver his Dirac Lecture, "What Chiral Symmetry Teaches Us About Particle Properties," on Thursday, 10 June at 11:30 a.m., in the Main Lecture Hall. On Thursday, 24 June at 11:30 a.m., the awards ceremony for 1998 ICTP Prize will take place in the Main Lecture Hall. The 1998 Prize in the field of High Energy Physics (in honour of Nobel Laureate Chen Ning Yang) will be given jointly to Anamaria Font from Universidad Central de Venezuela, Caracas, and Fernando Quevedo of Universidad Nacional Autonoma de Mexico. The public is invited to attend both ceremonies.