I was invited to speak at jQueryConf in San Francisco, 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 paid all of my travel expenses, and I was working while speaking at the event. It took me 5 days to prepare for my 20 minutes speaking slot, and I had a great time. I'm a man who has been speaking for 5 years. This was a not for profit event.