Great idea! Timing is the key.
I humbly propose the entire July 4th weekend when lots of traffic is on the road coming and going.
Sooner might be better but if we talk about it enough and it gains traction outside of here the media might become aware of it before we even do it.
I like your idea. I also think cheap Q inspired post -a-notes would be a good idea for anons to stick wherever they want discreetly like in stores etc.
I'm not sure what the post a note might say but it needs to be fairly short and impactful and provoke curiousity.