Just get the message out there. Put it on leaflets, placards, banners. Find a prominent place to hang a banner. Maybe take a banner to a US embassy or consulate, if one is close. Tell the media about it.
If you like the idea and plan to do something then, if you like, you could let us know. We can try and publicise whatever part of the plan you're happy with being made public and maybe it'll inspire other people to join in.
Also if you like the idea and you're going to be in Bonn on the 8th November (or otherwise during the COP) then why not get in touch ? [contact ] We'd certainly appreciate your help and suggestions.