Racing preview for this weekend has a mix of local and national events to see. Racing this week is a bit light locally but heavy on the TV and Internet side of things.   Things actually begin as Baldini’s Casino on Sparks is hosting its Freedom Festival. Highlighting Saturday is a visit from Livfast Freestyle MX riders. These guys will be jumping their motorcycles high in the air and doing tricks up there as well. Times are 2, 4 and 8 p.m. and it’s always a good show. And if a person still wants their racing fix and a fireworks