I was invited to speak at Future of Web Apps in Boston, so I travelled domestically 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 did not pay my travel expenses, and I was working while speaking at the event. It took me 2 weeks to prepare for my 30 minutes speaking slot, and I had a great time. I'm a woman who has been speaking for 3 years. This was a for profit event. Also, in addition to technical talks, they had social hours and networking spaces.