You have three different options when it comes to sidebar widgets for Calendarize it!
The first is the “Events Calendar”, which will display a basic mini calendar in the sidebar. This is a very basic calendar where you can click on a day and go directly to the day, week or month.
The other widget is for “Upcoming Events” and it has a lot of configuration options. Below you can see a screenshot showing all the options. You can also change the styling using the free Visual CSS Editor.
The third widget is the FLAT UI Calendar Widget. This is a free add-on available to all customers with a valid license.
You can login and take the plugin for a test drive before you decide whether to buy it or not.