For the past decade, the standard procedure for big coalition rallies and marches in Washington D.C. has been to gather together organizations representing labor, the environment, women's rights, anti-racism, anti-bigotry of all sorts, and a wide array of liberal causes, including demands to fund this, that, and the other, and to halt the concentration of wealth.
At that point, some of us in the peace movement will generally begin lobbying the PEP (progressive except for peace) organizers to notice that the military is swallowing up enough money every month to fund all their wishes 100 times over for a year, that the biggest destroyer of the natural environment is the military, that war fuels and is fueled by racism while stripping our rights and militarizing our police and creating refugees.
When we give up on trying to explain the relevance of our society's biggest project to the work of reforming our society, we generally point out that peace is popular, that it adds a mere 5 characters to a thousand-word laundry list of causes, and that we can mobilize peace groups to take part if peace is included.