I am on the Programme Committee for the upcoming LibreOffice Conference in Paris, and as a consequence I get to see the stream of paper submissions. There have already been a lot of diverse submissions and it’s already clear it will be a very interesting conference, but there is still room for more. Make sure you get your submission in before the August 8th deadline.
Of course, you can also contribute as a delegate. Registration is free and you can do it easily now. I suggest registering early as space is going to be at a premium.