hubbub

hälinä, mekkala A confused uproar, commotion, tumult or racket.
John Milton, Paradise Lost

At length a universal hubbub wild

Of stunning sounds and voices all confused,

Borne through the hollow dark, assaults his ear

With loudest vehemence.

It becomes a grotto, hubbubbing with more noise than any class on a school visit could make, the air mobbed by breathless chatter about life and the transfer window.