FREE ENTRY FOR EVERYONE After 21 years, Billetproof is going Down(Under)! This an event for traditional style hot rods, customs, lead sleds, choppers and cafe racers, built before 1965, as well as drag cars, classics and street machines built before 1980. For our first event outside the USA, with the help of our partner, the National Motor Museum, we've been allowed to take over the Torrens Parade Grounds (right behind Government House), in the heart of downtown Adelaide. The event…