Ashk'nazim do not eat meat or drink wine during what's commonly called the nine days (the first nine or so days of Av). However, they may do so at a mitzva meal, such as a one celebratingthat celebrates the siyum (completion) of study of a tractate of Talmud. Can an adult eat meat and drink wine at a meal in the nine days that celebrates a minor's siyum? Does it count?