I proposed an idea to speak at Railsconf in Portland, so I travelled domestically to speak. The event gave me a free ticket, and I was paid 500 USD 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 3 days to prepare for my 40 minutes speaking slot, and I had a great time. I'm a man who has been speaking for 0 years. This was a not for profit event.