Members of Cake are regular fixtures around Sacramento, their hometown; just last week, members have been spotted on the sidewalk outside Old Ironsides and on the Appetite Enhancement Ride on Thanksgiving Day. But to see the whole band play live is a rare treat.  But the band has not been idle. The members are recording what will be their sixth, as-yet-untitled studio album - their first in six years when it appears next year - and Monday night they included their hometown fans in the process, running through a handful of the new songs in a surprise appearance live at The Blue Lamp, at Alhambra and N Streets in the Grid. Several dozen people were turned away at the door when the house re