xiaix,

Typically, each Event is used to fire a Business Rule that will include the information you are trying to attach.

For example, here is an event: 

gs.eventQueue("knowledge.approval.inserted", current, grKB.owner_group, current.approver);

The first part is the event name that would be seen in the notification "When to Send" tab.

The second part relates to the current record that is associated to the event.

The third part, parm1, relates to the specific group or list or user that you want to send the email to.

The forth part, parm2, relates to the specific group or list or user that you want to send the email to. 

Parm1 & parm2 are there to provide you options on whom to send the email.

As such, your Business Rule would specifically call out the email list in your case as a variable in the script. Here you can see the way the grKB.owner_group is called out:

var grKB = new GlideRecord("kb_knowledge");
grKB.get("sys_id", current.document_id.toString());

So within your Business Rule script you would identify the email list that you want to send to in parm1 or parm2.

I hope this helps.

Regards,

Marshall