You do not need a permit as long as your demonstration does not violate any of the following conditions:

(1) Protest remains peaceful;

(2) Amplified sound is not audible from more than 100 feet from the audio source;

(3) Pedestrian/vehicular traffic is not interrupted;

(4) Streets and sidewalks are not blocked. A six-foot pedestrian pathway must be maintained at all times;

(5) Building entrances remain open.

If any of the above guidelines are violated the Police Department may ask individuals to leave the premises, or take enforcement actions. 

The following is an email I received with very useful information that we are going to try to follow for all of the rallies and protests that we attend:

Fellow Patriots,

I wish you the best, and I wanted to offer a few tactical suggestions for your demonstrations.

First, make certain you can assemble a big crowd. If necessary, combine with other neighboring groups to get a more "overwhelming" crowd.

Second, don't ever pose for a picture that could be published as a caricature of your group. Don't let a photographer get a picture that could reasonably accompany this story: "Six protestors showed up at the offices of the Smalltown Times Register on Saturday to protest their feeling that the media underreports crowd sizes at conservative demonstrations. In fairness to the group, after the photographer packed up his equipment, a seventh protestor arrived to join the group." It won't matter if 500 more people showed up 15 minutes after the picture."

The media is not above lying about you in this way. Did anyone see how Olbermann on MSNBC covered the crowd size estimate issue  a few days after the 9-12 march in DC? He actually used the Freedom Plaza camera time lapse video. He just stopped it when it looked like 60,000 to 70,000 people in the shot. Olbermann went on to say that was it. That was what Glenn Beck and "Fixed news" and the people at the "University of I Don't Remember" (why did Glenn Beck say that on Fox and Friends???) are calling a crowd of a million or more. Clearly there were only 70,000 people there, tops. But Olbermann never showed the hundreds of thousands marching down Pennsylvania Avenue. He just stopped the video before showing the whole crowd.

So don't pose for a caricature picture. I would recommend nobody bring signs to the demonstration area at the very start. Wait until the crowd looks big. Then, when the crowd is big enough to look significant, a few people at a time go back to their cars to retrieve their signs. People could even pool their signs at the parking area, sending one person back to retrieve signs for several people.

The visual effect you should strive for is a large crowd forming first, then signs for the protest popping up in that large crowd. And at the end, the signs disappear slowly, but everyone returns to the crowd after storing their signs. And at the final closing of the demonstration, the crowd (now without signs) disappears all at once.

If you follow those tactics, it will be very difficult for the press to get a picture of a very small group with just a few people protesting their reports of "crowd size."

Also, pick your targets in areas with a lot of public traffic. Even on the weekend. 

I wish you all the best, and I hope you can make a difference with this rally.