I am not setting Outlook as the default, and it is not pulling in Today’s events.
It is showing events that have been created using the “create event” premium feature when you select to add a date to an event.
The event is added to my online calendar either iCloud or Office 365 and then syncs to all of the calendar client applications that are logged into the particular account. In the case of Outlook it is signed into my business Office 365 account with no special settings.
I am guessing that if you dont have iCal (Calendar is the new name for it from Apple) and you are using Outlook in a company environment it is probably connected to a MS Exchange server so you will not be able to create events directly to Outlook from Agenda until it is supported.
Calendar is a default application in an install of OSX though so unless it has been removed by your company I.T. then you should have it and you can add a new account. If you are using Exchange for your company calendars then you can add an account of the type Exchange, assuming that this has not been blocked.