Add WooCommerce Products to your Calendar
Adding WooCommerce products to your front-end calendar operates in much the same way as a regular post.
You need to make sure you have Pie Calendar Pro installed.
Then, edit any product. Scroll down to the bottom and you'll see the Pie Calendar meta box.
Choose the appropriate options for your product, then simply publish your product.
Now, wherever you have your [piecal] shortcode added, your WooCommerce product will appear on the calendar.