Sharepoint 2013 doubt: how to add a agenda to a calender event?

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SharePoint2013

this is for creating a site with details of client visit to an office. so I wanted to create a calendar which shows the client visits on each day of the month.
now when I click on the client name on a particular date, I want a pop up with agenda of the client on that day in a probably hourly manner, which can be edited or removed.
For eg

9:45AM: arrive at office
10-11am: Meeting with X
11-13: meeting with Y and so on.

What I have tried:

I don't want to add the agenda as an attachment