Is it possible to get a User from a session without a req object?

Question

Node.js

The essence of the problem is this, there is an event handler, when the action is performed, the following code occurs

var newItem = new Item();
                    newItem.item.name = item.name;
                    newItem.item.description = item.description;
                    newItem.item.itemsCount = count;

I add an object to the mongo database, I would also like to add the submittedBy field with the name of the current user, but I can’t figure out how to pull it out and is it even possible?
If this is not possible, then in which direction to look? What is the best way to realize this moment?
Thanks in advance for all replies.