Because the builtin calendar doesn't have such an option.
Replaces the_time, get_the_time, the_date and get_the_date functions to translate date and time.
js-appointment - WordPress appointment and event calendar plugin
With this Plugin you can track multiple WordPress blogs as well as announce events in a calendar format.
Adds a stylish event calendar to the sidebar.
Smart Calendar is a modification of the wordpress calendar using ajax.
A plugin for make your own timeline calendar with lots of options.
** TESTING VERSION ** Adds events to your WordPress website. Future versions will include a calendar shortcode and widgets.
Displays Google Calendar(s) as custom styled weekly timetable/schedule in your blog. Easy to manage complex timetables from google calendar.
Email broadcast utility for MailChimp. Works with RSVPMaker.
Google Calendar plugin for WordPress
A powerful yet simple plugin for adding calendar functionality to posts. Great for using posts as events and calendar inputs.
Offical sweebe.com wordpress plugin!
Un-registers the default Calendar widget, and registers a new one which supports showing only those posts in certain (or all) categories.
BookCottages Availability Calendar http://availability.bookcottages.com/wordpress-plugin.php
This plugin allows your PlanGenius.com widget to work in WordPress. A PlanGenius.com account is required.
Stout Google Calendar allows you to add and customize the colors and options of embedded Google Calendars directly within the WordPress admin.
OneSport Event Calendar gives you an instant event calendar with popular events. Can also be used to list and promote certain types of club-only even
Display Hijri and/or Gregorian dates on your blog.
A modified version of the Widget build in to WordPress. It displays a link for each month, not for each day.
A calendar widget that shows post count per month.
WP-Cat2Calendar is a plugin which can organize posts into a calendar by category(/ies).
With RSEvents! you can create events and share them with your readers. It also has a built-in calendar that will show up your events.
Enhancements to Kieran O'Shea's Calendar plugin to allow multiple uses, theme styling, and more.
A simple event calendar for WordPress 3.0 MultiSite.
GCal Events List retrieves future events from a public Google Calendar and shows data in a widget.
WP Calendar Clock allows you to add a flash clock to your wordpress blog.
WP Picture Calendar shows a simple image calendar of World Days whith short description on Your sidebar.
A simple Calendar plugin for WordPress that allows 2 seperate calendars. This can be used as a drop-in replacement for the original Calendar plugin.