I proposed an idea to speak at Strata Conf in London, so I travelled domestically to speak. The event gave me a free ticket. My travel and accommodation was fully covered by the event. My employer did not pay my travel expenses, and I was working while speaking at the event. 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 10 years. This was a for profit event.