I would take them more seriously if they held this event in mid-January, rather than mid-June.
In 1990, I was at Wurtsmith AFB in Michigan, where I served in a B-52/KC-135 wing. We were told to expect a massive protest at the base on the Saturday that fell between the Hiroshima and Nagasaki anniversaries, because they had seen hundreds of anti-nuke folks in past years, and thousands on the 40th anniversary in 1945. IIRC, they were figuring on as many as 5,000 people, and they had the main gate of the base closed and cordoned off.
It rained that day. I counted 14 protestors. Here was a movement that claimed to believe they were saving their children from being vaporized (or worse) but they couldn't be bothered to protest if the weather was bad.
It was a great object lesson for me.