Beef. It’s What’s For Dinner. 300 kicks off 2021 Xfinity Series at Daytona. The 2021 NASCAR Xfinity Series season is upon us and Daytona International Speedway is all set to host this weekend’s Beef. It’s What’s For Dinner. 300 at 5 p.m. ET on FS1, MRN and SiriusXM NASCAR Radio.