Lake Area Rods and Classics will present the 20th annual Bluebonnet Car Show 8 a.m. to 3 p.m. April 13 in Burnet at Hamilton Creek Park.Set up is 8-11 a.m. Awards will be announced at 3 p.m.Pre-registration costs $20. Registration at the gate costs $25.There will be a cash prize for Best in Show, as well as hourly prizes and drawings for cash.First 100 entrees will receive one goody bag and shirt…