I was invited to speak at dConstruct in Brighton, so I travelled domestically to speak. The event gave me a free ticket, and I was paid 1000 GBP to speak. My travel and accommodation was fully covered by the event. My employer did not pay my travel expenses, and I used my PTO to speak. It took me 15 days to prepare for my 20 minutes speaking slot, and I had a great time. Also, the organisers were great, put me at ease and helped with a lot.