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Believe it or not, advocating the physical disruption........of someone else's function is not acceptable or legal behavior.
Believe it or now - and who won't believe it? - you have absolutely no idea what you're talking about. Even "advocating" violent revolution -- let alone "advocating the physical disruption of someone's event" -- is protected First Amendment activity and isn't the slightest bit illegal and can't be.
Squint your eyes really tight, try reading this, and then have someone explain to you what it means:
http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=US&vol=395&invol=444
On top of that, most of the people targeted have nothing to do with the group "advocating disruption," so your defense of the Police's behavior isn't only based on total ignorance but also outright lying.