Yes you can! From the left toolbar, select clip art, then the category for the desired artwork. All available clip arts are displayed to the left and then can be dragged onto the calendar.

 

Adding Clip Art to Event Dates

Step 1:

Select desired clip art category.

Step 2:

Select the month with the event.

Step 3:

Click on desired clip art for it to appear on the calendar.

Step 4:

Resize clip art then drag it to the desired date.