Are events in the commons?

Yes.
There exists a standard format for events, and I dunno what it is.  Lib ev likes one callback to compute the event, and on when the event is true,  End the end game, lib ev becomes part of the standard, and IO manager becomes tracker/keyboard; both call backs.  IO manager is hacked to make that easy.

I anticipate lib ev to be quite busy as users tune their set up and snippets all get on the call back list to update their rectangles. Then we have enterprise published events, like friday report collection. The department heads take a snap shot report and push it onto the report stack, events make sure the summary is in the right rectangle on he boss's  desk. Events, stacks ,collections, trees, strings of dimension, symbol table ops, even simple table extraction via sql; all these seem to me to be in the commons, no one can claim them. But they are necessary.