I proposed an idea to speak at Dutch PHP Conference in Amsterdam, so I travelled internationally 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 1 month to prepare for my 40 minutes speaking slot, and I had a great time. I'm a person who has been speaking for 4 years. This was a not for profit event.