Are these events listed online anywhere? What are the best ones?
If you mean a “materials” trade show… i.e. where plastics, metals, fabrics, construction materials, woods, ceramics, etc. are presented to prospective users it would be a huge exhibition, would it not?
A particular material producer would encounter too narrow of a market segment to address in this manner … as in $$$ return on investment.
Trade magazines, with refs to websites, provide more bang for the buck.
What are some of the better magazines?
there are literally thousands of trade journals and associations. so if you can narrow down what kind M+P info your looking for, you might get better answers from the baords.