You could create this in multiple ways.
Doesn't a single day listbox show this already?
Just make a new form and expand it to fit what you want to show.

I did this with a button on the calendar form.

First I had to loop through all the List Boxes on the form and set them all to Null except the one that was just clicked on. I used an Event Handler function with a For Each loop to do this which I called in the After Update event of each List Boxes. This is so no two List Boxes are ever selected at any given time.

Then I looped through the List Boxes with a For Next Loop in my button to get the date for that particular day, opened my form and set the values for my appointments on that form.