Give each one an HONORABLE DISCHARGE CERTIFICATE from THE MASCOT BAND at YOUR HIGH SCHOOL.
"Here ye all men and women that STUDENT NAME "having been a loyal and true member of the Mascot Band and having pursued all the musical obligations zealously, and having creditably met the director's requirements of the school, bringing honor and good repute to this organization, is hereby honorably discharged as an active member the Mascot Band and herewith admitted to membership for life in
THE MASCOT BAND EX-MEMBERS' ASSOCIATION. Therefore, in testimony of the merits of our fellow members and with the most sincere wishes for a long, successful and happy life, we have set our hands in witness this XX day of May in the year of our Lord, year XXXX.
You would get it signed by the superintendent, principal,and Band directors. I've given you the words - you can space it out and make the print like you want.