I always say a huge thank you before the concert finale. Typically I thank and recognize school/district administration, my paraprofessional, high school directors, parents, and students. I list our business sponsors in the program as well as verbally thank them during the concert. For any businesses who donate, I also present a framed certificate of appreciation, concert program, and thank you note. I keep track of parents who volunteer throughout the year and plan to present them with a framed certificate at the end of the year. Additionally, I sent out holiday cards to parents who had volunteered so far this year. People really do appreciate a hand-written personalized card 🙂 Not the most creative ideas, but maybe this helps!