So, like most people, you bought your opera/symphony/ballet/sfperf* tickets a year in advance when the economy wasn't reeling like an alcoholic after a half-case of Night Train. And now you're going to the show, but you really can't afford to dine out at wallet-emptying establishments like Absinthe, Hayes Street Grill or Jardinere anymore, even though you really want to make it a proper evening.
Don't despair! Your pre-show dinner can be both good and affordable, you only have to sacrifice the white tablecloths and three-continent entrees, and maybe walk a couple blocks more. Read the rest for a list of options.
One hint though: before going out in the Opera District, take a look at the Symphony, Ballet, Opera, CityArts and SF Performances schedules. If there are three or more events going on that night, eat somewhere else.