CREATE TABLE table_19759 ("Result" CLOB, "Date" CLOB, "Race" CLOB, "Venue" CLOB, "Group" CLOB, "Distance" CLOB, "Weight  ( kg ) " CLOB, "Jockey" CLOB, "Winner/2nd" CLOB)

When did the 55 kg participant race?
SELECT "Date" FROM table_19759 WHERE "Weight (kg)" = '55'
SELECT "Date" FROM "table_19759" WHERE "Weight (kg)" = '55'