Al Qassim Date Festival is the largest date festival in the world held annually in the central Al Qassim region of Saudi Arabia. It is estimated that about 300,000 tonnes of dates are sold annually. 

The festival is also accompanied by heritage activities that attract visitors from neighboring countries. Saudi Arabia has the highest number of palm trees in the world representing around 25% of the world's date production. 

Al Qassim region, where the festival is held, has more than 8 million palm trees.

The event lasts for up to 90 days, and sales exceed 1 billion Saudi Riyals, according to the Arab News, although other sources have claimed a figure in excess of 2.5 billion Saudi Riyals in other years. In terms of volume, that’s more than 300,000 tons.

According to en.wikipedia