I would recommend taking a look at http://hackdaymanifesto.com http://hackdaymanifesto.com Also as someone who has runs about one community event be it hackday

I would recommend taking a look at http://hackdaymanifesto.com http://hackdaymanifesto.com Also as someone who has runs about one community event be it hackday, designjam or barcamp a month I have learned to cater for everyone as best as possible.