Even if there are none, go over the specifics of when payment is due and when you will allow a make-up lesson. Both teacher and the other adult keep a copy of the contract. Any time there is a major change, such as institution a late payment penalty, everyone needs a fresh copy of the complete studio policy. Of course, you will be sending a letter to everyone explaining this major change, but enclose a copy of the complete policy, also. At this time, if you use a contract such as the one described above, create new contracts which both parties will sign.
Some teachers send out a copy of the studio policy every fall, at the beginning of the studio year.
If there are changes, even small ones, a letter should accompany the policy, drawing attention to any changes. Ph.D. Contact me about reprint permission.