The Bitcoin Fair is a global event to bring together and promote the bitcoin ecosystem. Starting in San Francisco, we're creating a fun event where both people from the bitcoin community, as well as regular people who don't know anything about bitcoin and are just interested, can come together and enjoy drinks, fun and get a few bitcoins that they can use with vendors at the fair.
The event will be full of tables with different companies(restaurants, bars, merchandise, websites) showing off what they have that you can buy with bitcoins. We also might have a contest like at an American street fair where people compete to be the #1 vendor for that month.
I imagine the logo being fun, and includes some graphics around the name "Bitcoin Fair" that make it very memorable. A few ideas include: a ribbon, a market place, a carnival tent. Whatever looks fun and makes people think of a place to go have fun and checkout bitcoin companies!
A style that is a mix between a State Fair Logo(https://www.google.com/search?q=music+festival+logos&safe=off&source=lnms&tbm=isch&sa=X&ei=IJzZUqqgHYjfoATb44JA&sqi=2&ved=0CAcQ_AUoAQ&biw=908&bih=978&dpr=0.9#q=state+fair+logos&safe=off&tbm=isch) and a Music Festival logo(https://www.google.com/search?q=music+festival+logos&safe=off&source=lnms&tbm=isch&sa=X&ei=IJzZUqqgHYjfoATb44JA&sqi=2&ved=0CAcQ_AUoAQ&biw=908&bih=978&dpr=0.9) might be a good inspiration for the logo style altho not look like its just for music, this is a fun event related to bitcoin and local vendors like restaurants, stores, etc.
Logo should work with or without a city name. For example, it should look good if it just says Bitcoin Fair, but also should have some alternative version where you can enter a city name, such as San Francisco, New York, Tokyo, Sydney, etc.
We're going to blow up this event and already have many sponsors and vendors lined up in San Francisco. This logo is going to be a big boost to your professional profile and will help take your design career to the next level! This event is going to be seen worldwide and will be on billboards and the media.