LeAnn Rimes and Lee Greenwood will join actor Ben Affleck and Miss America Ericka Dunlap in activities surrounding the Daytona 500 in Florida. Rimes will perform a concert and sing the national anthem prior to the 46th annual race. Greenwood will close the show with "God Bless the USA." Affleck has been named grand marshal of the race that's expected to be attended by President Bush.