Dear Abby, This Sunday will be my grandson's (first) birthday party. Friends of his dad, from where he works, will be there. They are Red Sox fans. Virulent Red Sox fans. They just were at the 100th anniversary game at Fenway Park, because that's where he proposed to her. What should I do? Should I: Remind them about 1986? Kid them about Bill Buckner? Talk about Bobby Valentine? Something else? If so, what? Later