Wouldn't 311 be the obvious call? I read somewhere that cities actually track those calls, so even if they can't fix the flyer, it gets logged and someone has to answer for it. Standing in an empty park with two bags of nothing is a bad look for the city, and they know it. I'd call, be polite, and ask them to confirm the next date in writing before you haul your gloves out again. Showing up next month on a guess just means you might be the only one there a second time.

It's funny how often the problem is the tool and not us, and we just assume we're messing up. @oliver719 that kind of thing happens everywhere, a bad scale, a slow clock, a dull blade, and we blame ourselves for way too long. Check the basics first and half your problems disappear.

That exact thing happened in my city two years ago with a plastic bag ban that got tossed out after like six people showed up yelling about their dog poop bags. The folks who wanted the ban just assumed it would stick and stayed home, so of course the loud ones won the room. Guess the lesson is you gotta show up or the other side writes the rules.