CREATE TABLE table_49887 ("Race Name" CLOB, "Circuit" CLOB, "City/Location" CLOB, "Date" CLOB, "Pole position" CLOB, "Fastest lap" CLOB, "Winning driver" CLOB, "Winning team" CLOB, "Report" CLOB)

Which Date had a City/Location of vancouver, british columbia?
SELECT "Date" FROM table_49887 WHERE "City/Location" = 'vancouver, british columbia'
SELECT "Date" FROM "table_49887" WHERE "City/Location" = 'vancouver, british columbia'