This page is here for any Game Jams hosted within this Community or in the MonoGame Community at large.
A dedicated page for Community Competitions exists.
And a page for External Game Jams and Competitions also exists for such a purpose.
Following the same guidance for listing your announcements on the announcements page, try to keep the description short and to the point, you may create a page if the information extends beyond a short paragraph in length.
More to follow in future.