PMD strives to plan sufficient tasks, tools, and materials for the number of volunteers signed up to participate. Charities depend on PMD, and thus our reputation as being reliable, self-sufficient, and great to host. When volunteers cannot participate, we need to know by the day before at the latest, so we can adjust appropriately. We ask you to call us (and leave voicemail), NOT use email, so that we will learn this information as quickly as possible. (When we are at a project, we are focused on the volunteers and cannot check for email cancellations.) Sometimes there are people on a backup list who we can activate to participate in your absence. When we are unexpectedly unable to complete all the work needed due to understaffing, we fail the charities we strive to serve.