Under the patronage of the Custodian of the Two Holy Mosques King Salman bin Abdulaziz Al Saud, Minister of Health Dr. Tawfiq bin Fawzan Al-Rabiah will open tomorrow in Jeddah the 4th International Conference for Mass Gatherings Medicine. The four-day conference, which includes 30 participant countries, will discuss a number of topics related to crowd management experiences.