Devhub is a community space for developers of all levels. Our mission is to engage the developer community and provide a hub where devs can come to work, learn, and exchange knowledge. We achieve our mission, in part, by putting on educational events for developers including Lunch&&Learns and Workshops.
A casual 45-60 minute talk targeted at the 1-3 year developer audience. We usually hold them on Tuesdays around noon, and they are free for people to join. As a result, speakers volunteer their time. Example here.
These are educational events - while we welcome you to mention your company and their product/service if relevant, this should not be the main focus.