The Scranton StorySlam is a unique storytelling competition at which ten storytellers each share a true, five-minute, personal story inspired by the evening’s theme. Stories are told without notes, allowing the storytellers to connect with the audience in a spontaneous and authentic way.
If you're interested in starting up a storytelling night in your area, this is a good site to check out. On this page, Scranton has compiled what they've learned at previous StorySlams and from various other storytelling organizations.
They have also provided a list of storyslams in other cities.