I was at the re-enactment of the Battle at Minuteman National Park with an audience of about (I guess) 500 people.

Based on local buzz regarding the 4/20 protests, I was curious if any "protestors" would show up, and, sure enough, there were a handful. Some of the signs included: "Veterans defending the Constitution," "Restore Federal Workers," "NO Kings" (presumably meaning President Trumnp), "Due process for everyone," and the one that tickled me the most "Stop the Insurgency".

There were only a handful of protestors, whose signs looked "homemade" with an attempt to be period so as to seem like they could have been spectators at the actual battle. To be clear, they were part of the audience, not part of the presentation, and there were plenty of state troopers around, so they were not likely to make a bit scene.

There were about 10-15 of them scattered throughout the crowd, all older, looking like typical local liberals; they were well behaved: mainly they just walked around with low energy (it was hot), occasionally engaging with other audience members, but mostly just moving listlessy through the crowd.

Definitely, not your Antifa crowd, but trying to make their point in their way.