How do you choose conferences to attend?

I have co-founded three fairly successful conferences on growth marketing, product management and remote business. All of them will take place in Kyiv, Ukraine this Fall, so shout out to me if you are interested in the topics mentioned about. I'm not sure that it is allowed to post external links here :) So my questios is: how do you choose a conference to attend? What is your annual conference budget? What makes you go to another country for an educational event?