I was invited to give a workshop at JSConf US in Amelia Island, so I travelled domestically to speak. The event gave me a free ticket, and I was not paid to speak. My travel and accommodation was fully covered by the event. My employer did not pay my travel expenses, and I took unpaid time off to speak. It took me 30 minutes to prepare for my 1 day speaking slot, and I had a great time. I'm a woman who has been speaking for 6 months. This was a not for profit event. Also, I was invited because an organizer saw the video of a related talk that I had done.