Mark your calendars:

Somewhere near you is a
Federal Building.
If there still is a planet
at 12 noon PST (3pm Eastern)
April 14th,

Be there
Wear black.
Be Silent.

As crows on a wire.

This is organized disorganization.
We will stare silently, deliberately, intently.
We will do no harm.

Bring food if you wish, potluck picnic even better;

but be silent and carry out your trash when we leave.

If you can't be silent, stay home.
Carry water and bail for us, if needed.

Here's how to find mine:

Los Angeles Federal Building
11000 Wilshire Blvd., Suite 1000
Los Angeles, CA

Region Served: California (all counties South of and including San Luis Obispo County, Kern and San Bernardino), and Clark County, Nevada

The Bus may be best. Let someone know where you're going in case you wind up needing bail.

Directions

By Car:

From North, take 405 Freeway South. Exit at Wilshire Blvd. going East. Cross Sepulveda Blvd. Federal building is on right. Turn right at Veteran Ave. to enter public parking area behind building.

From South, take 405 freeway North. Exit at Wilshire Blvd. going East. Federal Building is on right. Turn right at Veteran Ave. to enter public parking area behind building.

From East, take appropriate freeway to connect with 405 freeway. Exit at Wilshire Blvd., going East. Federal Building is in on right. Turn right at Veteran Ave. to enter public parking area behind building.

Public parking is free but is limited to 3 hours and is strictly enforced.

Bus/Metro Line: Contact Los Angeles County Metropolitan Transportation Authority (MTA), 800-266-6883 for bus lines and Metro Line information.

Could everybody please locate and post the address and directions to your local Federal Building if you don't see it here yet?
Here's a good place to pick it out: Wiki Federal Buildings

Kudos to Art in Eugene, and to Eugene, Oregon in general.
Here are more Federal Buildings.
Find Yours!
Dennis Chavez Federal Building and U.S. Courthouse (Albuquerque)
500-517 Gold SW
Albequerque, NM