This is a link to the site for the group that's protesting the monument. They're doing a lot of planning online, and you can get some information about their organizing tactics below.
One of their strategies is the "MLK CONTENT OF CHARACTER LIE" where they use some language like "this is hate speech" to smear the monument. They're using our lingo against us.
They are warning their supporters to not bring racist signs. They will find this increasingly difficult, as racists are attracted to anti-Mexican anti-Immigrant websites like moths to a lighbulb. Be careful, as these racists will use the "more moderate patriots" as cover for their activities.
They're getting paranoid, saying the Brown Berets will be there. These people probably never read anything about these activist groups except the slander that's posted on hate websites.