Anonymous, the anti-Scientology crowd, are celebrating dead bad-sci-fi writer turned bad-religion founder, L. Ron's birthday next Saturday in the Washington, DC, Wardman Park Marriott hotel--right where the "Church" is having a shindig. From the press-release:

We regret to inform you that due to time constraints, we are forced to hold the convention in the same building as Church of Scientology's L. Ron Hubbard Birthday Celebration for members of the entire central east coast of the United States

This Saturday in NYC, you can join in the fun across from the Times Square Church of Scientology on W. 46th Street.

In San Francisco, also this Saturday, meet at 701 Montgomery St. at the Transamerica Pyramid from 11:00 AM - 5:00 PM.

Here in Los Angeles, according to Enturbulation:

When and Where:
3/15 11AM-2PM @ 4810 Sunset Blvd., Los Angeles, CA (In front of Big Blue)

Address:
We take a three hour "break," you do your own thing, and we meet at the next location.
3/15 5PM - Whenever @ 665 W Jefferson Blvd, Los Angeles, CA 90007 (The Shrine Aud. aka L Ron Hubbard Birthday Party)

Events:
11AM-2PM is for us to get traffic's attention very well. At 5:30PM at the above listed Shriners, doors open for the Church of Scientology's birthday party for L. Ron Hubbard. His birthday is March 13th.

(Cup)Cake(s):
Cake and cupcakes are welcomed, just don't be offended if people aren't eating your food. There is obviously a risk of OSA plants poisoning the food, and no one wants that. Bring sweets for you and your friends, primarily.

Signs:
No "honk" signs please, that is a police request. Also try to avoid the use of the word "hate" in your signs, as it tends to bring in bad public attention.