I want to send out a schedule for different dates to friends who can help a caregiver and wonder if you know of an existing site that is set up for such already as the example I mentioned "Take a Meal". Thanks.
You could use any number of online schedulers, like Doodle - do a google search for Doodle scheduler. It allows you to input times and the attendees (or your relatives) can log in and mark the times they're available. Then it gives you a grid of all attendees and available times. It's meant for meetings and such, but it would work for this as well.
Alternatively, ask your friends what e-mail program they use. We used to use our firm's e-mail program to coordinate attorney schedules. That way you wouldn't be publicly sharing this information, even if the site has limitations for you and your friends' use only.