How to display node references and node back references in a single block

Hi:
I have a self-referential N-N noderelationship. Let's call the node type Event.
So, I can relate any number of events to any other number of events.

For a single node, I want a block that displays all the node's references and back references together, with no distinction between noderef and node backref.

I am hoping to use a views block, but I'm open to ideas.

For example, take this scenario, ("->" denotes a noderef):
node A -> B, C, E
node B -> C, D
node D -> A

The block I want on the node view for node A should list:
B
C
D
E

And for node D:
A
B

I think I am overcomplicating the situation,
because I'm sure this must be a common problem with an easy solution.
Halp Please!