A secret button for associates can press while in publics (or even group publics when a new update rolls out).
Just plays over the PA with a ding sound saying something similar to:
"Hello Kmart Shoppers! A new update has been added to Kmart, please exit the store. A portal has been open for your convenience."
Or
"Hello Kmart Shoppers! The official Kmart Instance has been open, please exit the store. A portal has been open for your convenience."
Would be a nice way to move things from publics to moderated group instances. Get people back into the group and have the group running so people can see Kmart is active in the Group instances tab for people who joined the shoppers group.