There are several that spring to mind like Richard Maxwell, Kelly Marks, Michael Pease, Jason Webb to name a few. There is also Ali the Bedouin horseman who is due over here in June - he is on Facebook and has an agent who does his booking in the Uk.
It depends quite a bit what sort of focus you're after, what your budget is, how high a profile you're aiming at etc. Are you looking for a "name" to bring the general public in? Someone to fit into a panel discussion? Someone with a particular speciality?