I proposed an idea to speak at HTML5 Dev Conf in San Francisco, so I travelled domestically to speak. The event gave me a free ticket, and I was not paid to speak. The event did not pay for my travel and accommodation. My employer paid all of my travel expenses, and I was working while speaking at the event. It took me 2 weeks to prepare for my 45 minutes speaking slot, and I had a mostly good time. I'm a person who has been speaking for 1 year. This was a for profit event.