a few of the options sort of apply, but i feel like a "this card references this other card" would be a reasonably connection category distinct from those currently supplied.
e.g. the connections i've created here: https://semble.so/url?id=https://www.urbanaffairsreview.com/community-wealth-building-symposium&sembleTab=connections
Yes, thanks for the feedback! Totally agreed, we heard this from others as well recently and will add this connection category