Bin Salman is in Mina to oversee the organization of the Hajj.

Crown Prince of Saudi Arabia, Prince Mohammed bin Salman, has arrived at Mina to oversee the organization of the Hajj on behalf of King Salman bin Abdulaziz.
The Saudi Press Agency "SPA" reported that "on behalf of the Custodian of the Two Holy Mosques, King Salman bin Abdulaziz Al Saud, Crown Prince Mohammed bin Salman, Deputy Prime Minister and Minister of Defense, arrived in Mina today to oversee the comfort of the pilgrims of the Holy Kaaba and provide them with services and facilities to perform their rituals with ease, convenience, and safety."
More than 1.5 million pilgrims from outside Saudi Arabia have arrived in the holy land to perform the Hajj rituals for this year.