I proposed an idea to speak at DrupalCon in Barcelona, so I travelled internationally 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 4 days to prepare for my 60 minutes speaking slot, and I had a mostly good time. I've been speaking for 4 years. This was a not for profit event.