Write an engaging article about the Del Mar Oaks, exploring the excitement of the Classy Soph Fillies competing for a $300,000 purse. Begin by highlighting the significance of this Grade I race and its place within the horse racing calendar. Include insights on the training and preparation that goes into readying these fillies for competition. Additionally, provide a brief guide for new fans on how to place bets and enjoy the race day experience. Conclude with a nod to the historical importance of the Del Mar Oaks and opportunities for community engagement in the sport.