Here’s another great organization dedicated to getting the math out to the people, Public Math at https://www.public-math.org.  They have just issued an annual report that is full of fun and interesting ways you can share math in public, and it lists all the great people doing this work with them.  These projects, like the postcard project or the math vending machine can be borrowed, adopted, or collaborated with by any institution or organization interested in increasing mathematics literacy in the community.