This (task --> calendar event) has come up in another thread recently. I think the OP might be on macOS, but if you're on iOS, see: Suggestion: Copy task to event for a shortcut that might help as an interim solution. 
This (task --> calendar event) has come up in another thread recently. I think the OP might be on macOS, but if you're on iOS, see: Suggestion: Copy task to event for a shortcut that might help as an interim solution.