FreeGameDev

If anyone's interesting in attending or helping to organize a Software Freedom Day event, they're currently planning this year's 20th anniversary in September. Please see the Software Freedom Day web site for details. You can join in the discussion on the Software Freedom Day mailing list or the SoftwareFreedomDay matrix channel. Please share this with anyone you know who might be interested. Thanks.

Not sure if you had any success, but I doubt it, since you didn't even provided an URI for that thing. Not even a date, so my comment might be entirely useless because the event is already done

https://www.softwarefreedomday.org/

And the date is 16th of September 2023.