I am using freya.
How to use and configure maya calendar as to-do application.
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Sign up to join this communityMaya is currently not designed to support this. According to elementary guidelines it also should not support this: they adhere the principle of apps doing one thing, and doing that in a great way. Calendars are not todo lists, so there are other apps better suited for this purpose. I.e. Go For It is a very nice app for this.