When you find out, blog about it. But I imagine you have
to be a recognized expert and thus invited. But then
again, it probably wouldn't hurt to ask local groups if
you can speak.
You can be a INETA Speaker by invitation only. And
AFAIK, each INETA region has a different speaker bureau
and different rules on membership. So I am not sure if
you could really go around the world being an member of
INETA speaker bureue. I would really recommend, that if
you do go around, you let the local UG lead know and I
am sure he/she will be more than willing to have you
speak at their group.