Running a club on pbwiki

I run a choir that do lots of church services a year (about 120), it is made up of about 60 volunteers and we'd like an online sign-in service, where people can log in and sign up for what services they can do. I've written a spreadsheet for attendance, but am not sure if this would be the best way to do it online: has anyone else done this before? What's the best way to go about it? Using a calendar?

Thanks!

Lilly
 
silly I’m confused!
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