Suggestion: wherever the information is available (with the understanding that it's usually not public), a very helpful thing to know is what the conference's d

Suggestion: wherever the information is available (with the understanding that it's usually not public), a very helpful thing to know is what the conference's default policy is on travel/lodging for speakers. If a conference is far away, but pays for travel and lodging, that's very different than if you're going to be out a lot of cash if you want to speak there. Knowing this up front can make a big difference in deciding whether to submit a talk.