The geographic restrictions on emigration have been removed for the duration of this event.
It's been on the login screen and account page for at least a month. Also, what continent are you on?
I think there is still geographic restriction. I got the following error message below when I try migrate my second character May who on Sonovoval region on Colonies island. Look like I have to travel to the capital itself to migrate, which will mean another 2 turns(Colonies island meaning 1 day).
You are not in a port (city, stronghold or townsland region at the coast or river).
Can you turn it on for Sovonoval region?