This just arrived in the mail today. I won't be able to make it - it was this one next August or Herman Price's Gathering this month for me, and I chose the latter. I had to strike while my iron was hot. But others may be interested in registering here.
Unfortunately, you're a bit late (by exactly 90 years and three weeks) to register for this one - the 4th Vienna Office Exhibition. But it does nonetheless look very enticing: