Table: imsa_race_data_3
Columns: race
length
class
circuit
date

Question: Which circuit is on July 24?
SQL: SELECT "circuit" FROM imsa_race_data_3 WHERE "date" = 'july 24'

Question: On which date was the GT class at Monterey Sports Car Grand Prix?
SQL: SELECT "date" FROM imsa_race_data_3 WHERE "class" = 'gt' AND "race" = 'monterey sports car grand prix'

Question: What was the length for GT class at Portland International Raceway?
SQL: SELECT "length" FROM imsa_race_data_3 WHERE "class" = 'gt' AND "circuit" = 'portland international raceway'

Question: On what date did Contac 12 Hours of Sebring take place?
SQL: SELECT "date" FROM imsa_race_data_3 WHERE "race" = 'contac 12 hours of sebring'