What was the main date of the round with 20 fixtures?
CREATE TABLE table_name_81 (main_date VARCHAR, number_of_fixtures VARCHAR)
SELECT main_date FROM table_name_81 WHERE number_of_fixtures = 20
### Context: CREATE TABLE table_name_81 (main_date VARCHAR, number_of_fixtures VARCHAR) ### Question: What was the main date of the round with 20 fixtures? ### Answer: SELECT main_date FROM table_name_81 WHERE number_of_fixtures = 20