I proposed an idea to speak at Full Stack Conf in London, 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 24 hours to prepare for my 30 minutes speaking slot, and I had a great time. I'm a man who has been speaking for 3 years. This was a not for profit event.