[itemzapp]

I recommend http://itemzapp.com - it can be used like a notebook, and it has not only calendar but also "someday" and "overdue" column. The cutomized view might be also handy. It's more productivity app, but it's web and it's easier than most of the organizing apps like wrike or asana. I'd suggest you try it and I hope it helps :)

Good luck finding the right app!