Strobist’s 2019 X-Peditions workshops (Havana in January and Hanoi in the fall) have both filled.
Hanoi actually filled before any public announcement. So if you think you might be interested in a future workshop, please make sure to sign up for advance notice on the X-Peditions info page.
If you would like to be placed on a wait list for either trip, you may do so at the individual workshop pages linked above.
Strobist