I proposed an idea to speak at Scala Days in Amsterdam, so I travelled internationally to speak. The event gave me a free ticket. 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 3 days to prepare for my 45 minutes speaking slot, and I had a great time. I'm a man who has been speaking for 10 years. This was a for profit event.