I was invited to speak at Midwest.io in Kansas City, so I travelled domestically to speak. The event gave me a free ticket. My travel and accommodation was fully covered by the event. My employer paid some of my travel expenses, and I was working while speaking at the event. My speaking slot was 1 hour for this event, and I had a great time. I've been speaking for 4 years. Also, Really great conference. I felt like the organizers really cared about the quality of the talks and happiness of the speakers.