Table: fa_cup_2008_09_2
Columns: round
main_date
number_of_fixtures
clubs
new_entries_this_round
prize_money

Question: What was the main date of the round with 20 fixtures?
SQL: SELECT "main_date" FROM fa_cup_2008_09_2 WHERE "number_of_fixtures" = 20

Question: What were the new entries for the Semi-Finals round with fewer than 8 fixtures?
SQL: SELECT "new_entries_this_round" FROM fa_cup_2008_09_2 WHERE "number_of_fixtures" < 8 AND "round" = 'semi-finals'