Creating a calendar event within your mentoring loop is easy. Whilst viewing your loop, click the plus on the left hand side of the chat input field. Then click 'Create an Event'. Once you've entered the relevant details, click save to set the event.
Then, whilst viewing the event in your Loop - you can click 'View in Sidebar' to see more details.
Here you can also export the event to your Outlook/iCal or Google Calendar: