You can easily personalize the C O L O R of your calendar text on Squarespace by adding a simple code to your CSS box.
First you need to choose the color you would like to pick for your event text. I found this website: Dynamic Drive, very useful and practical.
Once you are there, you need to select the color you want to use on the Color Picker side.
Then, you copy and paste the result. In my case: #731AB7
After that, you add the color you created to the code below.
CSS CODE:
.yui3-squarespacecalendar .item-title{ color: #731AB7 !important; }
Finally, you add that code to your CSS text box. It will look like this.
The calendar text will look like this:
This will help you to customize your text and give that personal touch you want to see on your work.