I don't know that the 1st amendment guarantees a place on a public platform. Sure it secures your and your group to practice unharrassed what ever you think appropriate. I think in order to have a place on a public platform you may should be required to have contributed in a significant way something to the well being of said public. For example a monument to Firefighters as opposed to me placing a monument to myself. Not that I don't contribute, but my contribution is not extraordinary.