Risograph printing has become the default for this kind of work because it rewards bold choices. Flat colours, slight misregistration and visible texture make even a simple layout feel alive.
Accessibility is part of the job, not an afterthought. Neon on black can pass contrast checks; neon on white usually cannot. Test it before you print five hundred copies.
Contrast Is a Feature
Loud design gets a bad reputation because it is easy to do badly. Done well, it is the fastest way to tell someone what is happening, where and when, from the other side of a busy street.