The Right to Assembly as guaranteed by the Constitution means the government can't stop you from gathering because they don't like you or don't agree with you. If a government official broke up an Assembly for no good reason, the Supreme Court would be on your side.
But, like all rights, it is not unrestricted. Your Freedom of Speech rights doesn't allow you to yell 'fire' in a crowded theater causing a panic. The government will surely punish you for it and the Supreme Court would applaud.
The assembly of citizens can be curtailed if governments have sufficient reason, usually dealing with public safety. They can impose curfews. They can keep crowds off of public parks to protect the park. They can impose martial law. They can disburse assemblies that have become violent or destructive. They can quarantine infectious people.
And if the government did so for the proper reason of public safety... the Supreme Court would applaud.
Your ideas of sovereign citizenship and unfettered licentiousness is right wing nut case territory.