Nonsense covers the stuff that has no name, or a name that you feel really awkward and self-conscious saying out loud, like “underground.”
e.g. Street events, loft parties, puppet shows, bike rallys, costume balls, interactive art shows, movies in unusual places, parades, outlaw dancing, guerilla theater, burlesque and variety shows, loser open mikes, cirkuses, and absurdist pranks.
-via Nonsense NYC.
And thanks to Sxip Shirey for the recommendation of this article @ Brooklyn Based: