[Tunis Afrique Presse] Tunis/Tunisia -- The 21st edition of the "24h Non-stop Theatre" international festival will be organised by the Centre of Dramatic and Scenic Arts in Kef, April 28-May 1, with the participation of artists and academics from 13 countries, namely Tunisia, France, Italy, Spain, Russia, Brazil, Iran, Saudi Arabia, Iraq, Jordan, Amman, Algeria and Libya.