what is the first performance of the last performance on 03/29/1957
CREATE TABLE "table1_19189856_1" (
  "performer" text,
  "performances" real,
  "category" text,
  "first_performance" text,
  "last_performance" text
);
SELECT "first_performance" FROM "table1_19189856_1" WHERE "last_performance"='03/29/1957';