three-ring circus

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A circus having simultaneous performances in three separate rings.
• noun Informal A situation characterized by confusing, engrossing, or amusing activity.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A large circus in which three separate performances are staged simultaneously, each within its own circular enclosure.
• noun idiomatic, by extension A disorderly, complicated, rapidly changing situation or set of events, which is a source of bewilderment, amazement, or amusement.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a circus with simultaneous performances in three rings