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Often I'm in my Inbox reading a message about an upcoming event (webinar, meeting, conference call, etc.). I would like to add that event to my calendar, so I naturally click on the Calendar icon. But then I can't see the message with the event details. Here's how to make it easy:
Under the Add button, it currently shows Tasks. Just add another choice for Appointment. You could even scan the message for a date/time to pre-fill the form. Gmail has something like that where you can hover over a date/time and add it to your calendar. That would be even better, but probably more difficult.