From Longman Dictionary of Contemporary Englishdescend on/upon somebody/something phrasal verbVISITif a large number of people descend on a person or a place, they come to visit or stay, especially when they are not very welcome Millions of tourists descend on the area every year. → descend→ See Verb table
Examples from the Corpus
descend on/upon • The illness which had descended on her seemed to draw in its claws.• Her children descended on me in a fury.• When the world descended on Sydney last month it was with trepidation.• Outside it slowly got darker, a gloomy purple descending on the car as it stood in the empty lot.• Almost immediately, a heatwave descends on the rest of Britain.• He must bear primary responsibility for the chaos that descended upon the White House when such disclosure did occur.• In this way, the children became spread out instead of all clustering together with the coins descending on them like hailstones.• In those times, a poet could descend on you with all his retinue and eat you out of house and home. 