A new widget that shows a calendar based on existing post types.
<ul>
<li>Select any available post type to show</li>
<li>Filter by any custom taxonomy term tied to the selected post type</li>
<li>List a maximum of 10 items below calendar</li>
<li>Set a prefix for every listed item</li>
<li>Filters and hooks</li>
</ul>

WordPress Calendar For Custom Post Types

Because the builtin calendar doesn't have such an option.

KrishaWeb

Dilip Bheda

Pratik Gandhi

Girish Panchal

This plugin gives flexibility to user to change posts from one post type to another. Also users can change posts from post type to page.
Features 
• Easy installation 
• Post to other post type or page. 
• Free support
Checkout the advanced features of Post Type Transfer: 
• It provides functionality enable/disable the feature for certain post type. 
• It also provides functionality to transfer the taxonomy while transferring the post to other post type. You can create new taxonomy or use the current one.
<a href="https://codecanyon.net/item/post-type-transfer-pro/21585540" rel="nofollow ugc">Get the Post Type Transfer Pro</a>
<h4>Supported Types</h4>
The plugin will help you to transfer any post’s post type to other post type. It will also allow custom post type. Invisible post types like revision, menu and attachment are purposely excluded

Post Type Transfer

Easy to use

A simple way to change a post's post-type in WordPress

WordPress Calendar For Custom Post Types vs Post Type Transfer