I proposed an idea to speak at JSConfAsia in Singapore, so I travelled internationally to speak. The event gave me a free ticket, and I was not paid to speak. My travel and accommodation was fully covered by the event. My employer paid all of my travel expenses, and I used my PTO to speak. It took me 6 weeks to prepare for my 45 minutes speaking slot, and I had a mostly good time. This was a for profit event.