CREATE TABLE table_8051 ("Date" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Box Score" TEXT, "Report" TEXT)

How big was the crowd when the South Dragons were the away team at the Gold Coast Convention Centre?
SELECT "Crowd" FROM table_8051 WHERE "Away team" = 'south dragons' AND "Venue" = 'gold coast convention centre'
SELECT "Crowd" FROM "table_8051" WHERE "Away team" = 'south dragons' AND "Venue" = 'gold coast convention centre'