CREATE TABLE table_18796 ("Season" FLOAT, "Premiers" TEXT, "Runners Up" TEXT, "Score" TEXT, "Captain" TEXT, "Coach" TEXT, "Simpson Medal" TEXT, "Venue" TEXT, "Attendance" FLOAT, "Umpires" TEXT)

Which venue did Luke Blackwell serve as captain?
SELECT "Venue" FROM table_18796 WHERE "Captain" = 'Luke Blackwell'
SELECT "Venue" FROM "table_18796" WHERE "Captain" = 'Luke Blackwell'