Catch up TV on Summernats. Watch the latest and all other episodes of Summernats now online, broadcasted on 7Two. Catch up on your favorite 7Two TV show: Summernats. Replay tv on its best! 1500 of the toughest Australian elite street machines descend on Exhibition Park in Canberra for the annual Street Machine Summernats Car Festival - Australia's biggest horsepower party.