The Legal Aid Society of Metropolitan Family Services had a record turnout and heard three special stories on how the society helped them at its annual pro bono award luncheon last week.The organization marked a busy year serving 10,286 clients — about 2,000 more people than the previous year.The Wednesday luncheon at The Standard Club raised $350,000 and was the most successful in the organization’s history, according to its organizers.Jenner & Block LLP Chairman Anton R. Valukas said the luncheon had so …