Shop ’til you drop at this marathon of Christmas cheer and commerce. Stores stay open until the witching hour on the first of Annapolis Business Association’s two Midnight Madness nights of sales, discounts and holiday festivities along Main St., Maryland Ave., inner West Street, City Dock and State Circle. Among the musicians entertaining shoppers are the barbershop-harmonizing Sons of the Severn. Take the Circulator free. Also Dec. 12. 6pm-midnight, downtown Annapolis: www.annapolisbusinessassoc.com.