A watched pot never boils.
If you wait around at the bank until the stag shows up, you're only really going to get frustration for yourself. Even if it does show up, and gives you something super valuable, you still wasted all that time waiting, when you could have been doing something more interesting than watching paint dry
As I figure it, the stag would go to where the action is
There's people at Luna, but most of them'll be AFK.
The screenshot Mapper posted was a player event on Europa. At least, that's what I (and Europa's EM) would do.
I suppose my point is to do something, in the community, and you're likely to get the EM's attention. Lurk around Luna, and you're unremarkable in a crowd.