How to prepare for and what (gadgets) to take to Wikimania?
My answer to How to prepare for and what (gadgets) to take to Wikimania? on Quora
As general conference advice, carrying as little as possible is a very good idea. These days I take an 11 inch MacBook Air, an iPhone and an external battery for the iPhone (thus making it run out at the end of the day as opposed to half way through the afternoon). I only have the MacBook Air in case I’m on support duty and need to fix something—I’d prefer to just have the phone.
That said, if you expect to be doing a lot of hacking on a laptop you can make friends VERY quickly by carrying your own extension cable and multi-plug adapter—that way you can always share power points with other people, and if someone already has the power point you can still plug in with them.