There's a page in our profile under Game Jams, called 'Game Jams You've Joined'. After a jam's ended, whether you've submitted a game / project or not, the jam shows up on this page. It's good to keep up with the time you have left and a few other stats. 

But it would be nice to remove a jam from this page / remove yourself from a jam if you haven't submitted anything for it (after it ends).

(moved to the right category)

I second this.

I completely agree—it would be great to have an option to remove ended jams from the “Joined” section. Sometimes I join just to follow updates but don’t end up submitting anything. Having those stack up clutters the dashboard. Even a simple “hide” toggle would help keep things tidy for folks who join lots of jams but don’t always participate fully.