CREATE TABLE table_204_991 (id DECIMAL, "name" TEXT, "first\ held" DECIMAL, "country" TEXT, "earliest attendance figure known" TEXT, "1998 attendance" DECIMAL, "2000 attendance" DECIMAL, "2002 attendance" DECIMAL, "2004 attendance" DECIMAL, "2006 attendance" DECIMAL, "2008 attendance" DECIMAL, "2010 attendance" DECIMAL, "2012 attendance" DECIMAL)

what was the first anime convention name held in canada ?
SELECT "name" FROM table_204_991 WHERE "country" = 'canada' ORDER BY "first\nheld" LIMIT 1
SELECT "name" FROM "table_204_991" WHERE "country" = 'canada' ORDER BY "first\nheld" NULLS FIRST LIMIT 1