plainware

Signteer is a lightweight volunteer sign-up sheets plugin designed to help your organization keep track of volunteer opportunities, tasks and sign-ups.
Features:
<ul>
<li>Admins can post sign-up sheets with permalinks.</li>
<li>Volunteers can sign up directly from the sheet page.</li>
<li>Admins can control the tasks for each sign-up sheet and number of spots for each task.</li>
<li>Admins can view the list of all volunteers with the history of their involvement.</li>
</ul>
<h3>Support</h3>
Please contact us at https://www.signteer.com/
Author: Plainware 
Author URI: https://www.signteer.com

Signteer

A volunteer sign-up sheets plugin to let your volunteers sign up for your tasks.

scottmotion

Enable a cron event that will remove active and/or pending user signups from the database.
Features: 
* Displays information about the signups table such as size and number of signups. 
* Enable or disable removal of active and pending user signups independently. 
* Set separate thresholds for how old the signups should be before removal. 
* Choose to email a report to the Site Admin each time the event runs. 
* Set how often the cron event will run and see when the next event is scheduled for.
Compatibility:
This plugin is designed to work with single-site installations running BuddyPress (2.0 or later) or BuddyBoss.

Signups Cron

Manage WordPress user signups via WP-Cron.

Signteer vs Signups Cron