Devcon is the yearly Developer's conference. FMI invites topic submissions some time in December. Those topics are typically not commercial as in "showing the solution that you are selling". For that there is a Vendor's area where you can purchase a booth to show off your solution. There are also a few "unconference" sessions available to show off your solution.
The main topics are all about sharing something that folks can learn from. Something you are happy to give away, not sell.
Thank you very much.