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Related to descend on: descend upon
descend on (something)
1. Literally, to drop onto someone or something. No one was too pleased when rain began to descend on our picnic.
2. By extension, to converge at a particular place or thing, often in great numbers. The kids descended on the birthday cake as soon as I set it down. People have descended on our town to attend that big software conference.
descend (up)on someone or something
1. . Lit. [for something] to come down or fall upon someone or something. Flakes of fluffy snow descended upon the gentle slopes.
2. . Fig. [for people] to arrive or come to someone or something in great numbers. The petitioners descended upon the mayor's office in droves.