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There is now a different chat application that can be used anytime. You'll find a link in the menu at the top of every page which also shows how many people are currently in there. If you float your mouse over the link, it will also give you their names.
This uses a few system resources and is initially there for a trial period. It won;t be replacing Wednesday night chat as it quite likely would not be able to cope with the number of people online at the same time.
Have fun!