dhtmlx

An easy to implement event calendar plugin built on top of <a href="http://dhtmlx.com/docs/products/dhtmlxScheduler/" rel="nofollow ugc">dhtmlxScheduler</a> 
that provides an Ajax-based scheduling interface similar to Google Calendar. The plugin allows you 
to manage single or multiple user events, display any type of events and appointments, and put a list of the upcoming events on a side bar.
Users can add/edit/delete events on the fly and easily change event date and time by simply dragging the event boxes. 
You can set up different levels of permissions to people who will use the calendar: make the scheduler read-only or allow 
a group of users to edit the events through a web-based calendar interface.
The calendar can be configured to display events in Day, Week, Month, Agenda, Timeline view, as well as in any custom view. The intuitive admin panel 
makes it easy to customize the calendar to your needs. You can use the plugin as an event calendar or as archive calendar to display your blog posts archive (in this case it works in read-only mode).
Main Features
<ul>
<li>Day, Week, Month, Year, Agenda, Timeline Views</li>
<li>The ability to create a custom View </li>
<li>Ajax-enabled, intuitive interface</li>
<li>Drag-n-drop support to configure event date and time</li>
<li>Easy-to-customize</li>
<li>Single/multi-day events </li>
<li>Customizable time scale </li>
<li>Recurring events </li>
<li>Configurable access and edit rights</li>
<li>Upcoming events widget</li>
<li>Localization to more than 20 languages</li>
</ul>
What’s New in 3.0
<ul>
<li>Week Agenda View</li>
<li>Map View (integration with Google Maps)</li>
<li>Timeline View</li>
<li>Full day event</li>
<li>The ability to display event creator </li>
<li>Export to/from Google Calendar</li>
<li>Built-in export to PDF and iCal</li>
<li>WPMU support</li>
</ul>
Requirements
<ul>
<li>PHP 5.0 or greater</li>
<li>MySQL 4.0 or greater</li>
</ul>

Event Calendar / Scheduler

Event calendar plugin that allows you to add a nice-looking scheduler/planner with drag-n-drop interface, recurring events, Google Map integration.

mormat

[mormat_scheduler] is a shortcode that render an event scheduler component. The purpose was to provide an alternative to Google’s scheduler.
The scheduler offers three calendar views : <code>day</code>, <code>week</code> or <code>month</code>.
Events can be created, edited and deleted directly from the scheduler (which can be done by logged in users only).
Drag and drop is also available.
<h4>Shortcode parameters</h4>
<ul>
<li>height : Define the height of the scheduler. It must be a css compatible value (for instance “640px” or “70vh”). </li>
<li>initial_date : A date from which the scheduler will start displaying the events. If not provided, the current date system will be used. A string formatted as “yyyy-mm-dd” can be provided or any value compatible with the <code>Date</code> javascript object. </li>
<li>default_view: The default view used for displaying events. Allowed values are “day”, “week” or “month”. Default value is “week”</li>
<li>events_namespace: Useful only if you need to display and manage a specific set of events. The default value is “”.</li>
<li>locale : i18n locale used for displaying dates (For instances <code>en</code>, <code>en_US</code> or <code>en_GB</code>). Default value is the website’s current locale.</li>
</ul>

Mormat Scheduler

Add a Google-like scheduler to your WordPress site

Event Calendar / Scheduler vs Mormat Scheduler