The dress code is casual. Whatever you want to wear to be comfortable. A shirt with a logo of your favorite tech tool can be a great conversation starter. If bow ties give you confidence, go for it. There is also a fair amount of walking, so wear comfy shoes!
You will walk away with many ideas, so be prepared to record them either with a device or on paper. Sessions do not have to be about technology, but many times they will be, so bring a device so you can play along with everyone else. Wi-Fi will be available in all rooms. Instead of using projectors to share information with other people (and to resist the urge to present with a PowerPoint or such), there are Google Docs linked on the schedule so everyone can share information/resources that way.