By now, with Mother’s Day approaching on Sunday, May 10, Brian Tam’s two restaurants would be comfortably booked with reservations.The longtime local restaurateur and his staff at Tam’s BackStage and Tam’s Tupelo in Cumming would be anticipating the rush of families going out to celebrate moms with a special meal.This year, amid the coronavirus pandemic, that is going to look a little different. Unlike some establishments around the county and state, Tam has not reopened the dining areas in his restaurants despite the OK from Gov. Brian Kemp.