Cyber-sista,
I would agree with the general statement that picketing a convention site may not be "very effective", if what you are looking for is instananeous deprogramings. I remember walking out of Dodger Stadium towards the bus stop at the bottom of Elysian Park Blvd., and looking at those signs. I saw one that had a phone number. I memorized it, and called it from work the next week. It began a process that took nearly five years to complete, but it started the ball rolling.
I don't think that most of us that have left the Borg, woke up one fine morning and decided to chuck it all. It was a process. A process that perhaps was started by something as small as a phone number, or a slogan on someone's sign.
The key thing to remember is yes these things can be effective, but the most effective way of getting people out of the Borg is to show them something they can't possibly have in the Borg. True and unconditional love. Love that says, "I'll be there for you, whether or not you come out of the Borg." That is how I maintain my circle of persons in the Borg. They know they can trust me, and that I am their friend even though they still choose to remain in the Borg becasue of the internal pressure.
LABD