Balshazzar's Feast is located near the west end of the East Rampart area. The formation is broken up into three terraces, each containing a few routes. This formation sees less use than many of the formations on the East Rampart.
To find Balshazzar's Feast hike up the CCC trail and head around D'Arcy's Buttress, then hike west along the top of the cliff. When you reach the Leaning Tower, descend the Leaning Tower Gully and turn right (west). Walk about 100 feet along the base of the cliff. If you come to a giant 20-ft high boulder you've gone too far.