FOSDEM is a large open source conference, and the one in 2022 will be online (again). This year there will be a Public Code track (or devroom like FOSDEM likes to call it). With Public Code, we mean code that implements public policy in some way. I am pretty sure there are many in this forum that have something interesting to share.
The Call for Proposals is open, and the deadline is 26th of December. If you have any questions, feel free to ask them here or PM me.