lupka

This plugin allows you to create a widget that will display the title/date/excerpt from random posts in a specified(or open-ended) date range. It can also be used outside of a widget to create custom loops of random posts within a date range. The following can be specified:
<ul>
<li>Number of posts to display</li>
<li>Whether or not to show dates</li>
<li>Whether or not to show excerpts</li>
<li>Excerpt length (number of words)</li>
<li>Start date and End date of posts to randomize</li>
<li>Whether or not to always use current date as end. (Allows you to include new posts without editing settings every day)</li>
<li>Option to use relative time instead (To chose from random posts from last week, year, etc.)</li>
<li>Category to choose posts from. (Example: Random posts from sports category in the past week. This is the original reason I needed a plugin like this. Comes in handy for the newspaper site I run.)</li>
</ul>
Please contact me if you run into any issues, either via email (lupka31@gmail.com) or Twitter (http://twitter.com/lupka) 
For latest FAQs/info visit: http://alexchalupka.com/projects/wordpress/random-posts-widget/

Random Posts Within Date Range Widget

Widget that displays the title(w/ link), date(optional), and excerpt(optional) of random posts within a selected date range.

Robert Peake

Based on the original Random Redirect, this plugin enables efficient, easy random redirection to a post. Supports setting a category for all random redirects, shortcodes to generate URLs that can override the default category, and setting your own redirector URL. Designed to scale to handle high-traffic websites with thousands of posts by using a more efficient strategy than most other redirection plugins employ.
Based on the original Random Redirect by Matt Mullenweg https://wordpress.org/plugins/random-redirect/
Special thanks to Tim Green for providing additional quality assurance testing on the popular rattle.com website.

Better Random Redirect

Based on the original Random Redirect, this plugin enables efficient, easy random redirection to a post. Supports setting a category for all random re …

Random Posts Within Date Range Widget vs Better Random Redirect