When you edit a calendar, you can see that each day is available in a grid view. There are 25 days available for each month. When you place the mouse pointer on any day of a month, the Create link appears as below.
Click on Create link and the window appears as below.
You can add one of the following media to your day.
Add Image: You can drag the image from your system and drop it to this window. You can also add the URL where image is located.
Add Video Link: You can add the URL of video
Add Link: You can add the URL of the link
Add Text: You can add any text for day. You can also add the background color for text.
The media that you select is shown on top of the day view as below.