Just what the previous poster quoted, the whole store contents get sold to some liquidation company, all the employees are fired, the prices are marked up to full retail, then the liquidation company offers some employees a typically lower wage to stay on for a month of the "sale" where every few days the discount increases until nothing is selling and remainder gets sold as a lot or moved to the next store that is getting liquidated. Typically no bargains at all since the price drop is balanced by no returns and a chance the item suffers from being an open box or return with missing parts or problems.
YMMV, but after checking a few other events, I don't waste my time.