At least that's what the fine folks at our Cochrane, Alberta location named it.
The concept is to remember everything that was taught at a workshop... or at least give it your best shot!
The more people from your area that attended a workshop, the better chance of remembering everything, or most of what was taught.
When classes resume after a workshop, and while it is still fresh in everyones mind, jump on the opportunity to go around the room and have everybody remember what they recall from the workshop. Ask what they personally learned and what corrections they received.
By putting all your heads together there is a very good chance of recalling the entire workshop.
This has the added benefit of furnishing the group with a good supply of material to work on for weeks and months to come.