CREATE TABLE "regional_auditions" (
  "episode_air_date" text,
  "audition_city" text,
  "date" text,
  "first_audition_venue" text,
  "callback_date" text,
  "callback_venue" text,
  "golden_tickets" real
);

Question: Which city had the charleston area convention center as its callback location
SQL: SELECT "audition_city" FROM "regional_auditions" WHERE "callback_venue"='Charleston Area Convention Center';

Question: When did the callbacks from  rancho bernardo inn air
SQL: SELECT "episode_air_date" FROM "regional_auditions" WHERE "callback_venue"='Rancho Bernardo Inn';