Steps

First i used the pen tool and brush tool to outline my tree. I also used the start tool to make a star a the top of the tree. Then I colored the tree and star. After that i used the Type Tool to put the dates. The I use the rectangle tool to make the border of this work so that i can use Live Paint Bucket. After making the border I filled in the background color and also I change the font color to white. Then I made lines using pen tools. After that i use gradient tool to give life to my tree. I also add snow to the background. For the finishing touch I made my snow and my lines blurry so that it gives a more impact image to the calender.