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

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'