A centralised list of IRDs is now available.
This on the American Association of Woodturners (AAW) website. It is largely focused on the AAW demonstrators though some UK turners, e.g. Paul Hanaby and Phil Irons who are members of AAW, have put their details forward.
These demos are likely to be charged for, generally this will be in the region of ten pounds or ten dollars. So you will need to register to see the demo, but watch out for the time difference.
AAW currently not accepting new notifications from demonstrators. Not sure why.