I also don't know a dedicated thread or tag, but currently there's also this jam: https://itch.io/jam/continue-your-game-jam (8 days remaining).
...maybe this thread can be dedicated to listing such jams?
Well my game is already released (despite it's still expanding) so i guess it won't fit.
In any case the thread is not supposed to revolve around me, so yes please: i invite anyone to share and list those jams for everyone's sake!
