Question: Tell me the date for acts of 6 bands and year larger than 1981 for Monsters of Rock
SQL: SELECT "Date" FROM "2-10311801-1" WHERE "Acts" = '6 bands' AND "Year" > 1981.0 AND "Event" = 'Monsters of Rock';

Question: Tell me the stages for 1981
SQL: SELECT "Stages" FROM "2-10311801-1" WHERE "Year" = 1981.0;

Question: Tell me the event for 6 bands
SQL: SELECT "Event" FROM "2-10311801-1" WHERE "Acts" = '6 bands';