Protesters already do so. Those fees are called taxes. The First Amendment says:
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances. (emphasis added)
Abridge means to reduce in scope. Charging citizens to peaceably assemble and petition the government is a violation of the First Amendment.
Unlike the political parties, I fight for all rights, no matter which party is in office.