Originally Posted by Michael:
I Suggest you send an email when letting them know your days off. That way you can provide the email as record and notification. You are a volunteer. They are treating you like they are paid employee.
Completely agree! They're counting on you a.k.a. taking advantage of your kindness and generosity and should NOT be expecting you to fulfill the needs of an employee. A volunteer is someone extra who is wonderful to have but the place can run otherwise too, KWIM?