cacophony - kah-KOFF-uh-NEE - a harsh & discordant mixture of sounds, stridently noisy, raucous

Example: "The 20th anniversary of the fall of the Berlin wall tonight - which will be celebrated by tearing down a mile and a half long styrofoam wall constructed for the occasion - is expected to be boisterous, accompanied by beer drinking and a cacophony of sounds well into the night."