… step is to assess whether or not they respond well to your product. This usually requires building a solid functional prototype that users can take out of a box and interact with. Focus on a minimal feature set that’s strong (rather than a half-baked, but large feature set).
… to dads talk to their kids and even other kids talk to each other while standing around the booth. Ways you can demonstrate the community growing around your product (and of course why that happens) is roughly equivalent to a K-factor in SaaS products.