This post gave me an idea how to utilise this as a monthly calendar. This could work with both links and empty (in my case) calendar style. So by using highlighter, you can mark down dates with certain color, and write down below more about those events. Here’s an simple example:

Only issue I see is having multiple events on the same day, as well as limit to only 5 colors, but this is still a nice option to give life to monthly journal pages.
Also this concept could be used for habit tracking, with using for example pink as red, orange as yellow and mint as green markers.