That is definitely adequate. As a dance teacher, I know how much time and work it takes to produce quality shows, I would rather have my child/students perform in three high quality shows rather than ten sloppily put together performances. Quality, now quantity. I have run my own dance program before and my students did two shows per year, a nutcracker performance in December, and a spring show in may. We did do extra performance opportunities sometimes such as parades. I also took several groups of students to a dance competition once per year. One year we attended a dance festival in Disney World. Overall, I would be more concerned with the quality of my child’s dance education, rather than how many times she performed.