I proposed an idea 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 5 days to prepare for my 8 hours speaking slot, and I had a great time. I'm a man who has been speaking for 2 years. This was a not for profit event.