I proposed an idea to speak at DjangoCon in Cardiff, Wales, so I travelled internationally to speak. The event asked me to buy a ticket at full price. The event did not pay for my travel and accommodation. My employer paid some of my travel expenses, and I took unpaid time off to speak. It took me 2 days to prepare for my 20 minutes speaking slot, and I had a great time. I'm a man who has been speaking for 1 year. This was a not for profit event.