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DescriptionURLHow does it work?Does it use the wp_posts table?Anca's comments

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RSVPMaker.comYou can have people rsvp and or pay for events on your website

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Event EspressoFree and premium version that allows for event registration, etc.http://eventespresso.com/

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GigpressGigPress is a powerful WordPress plugin designed for musicians and other performers. Manage all of your upcoming and past performances right from within the WordPress admin, and display them on your site using simple shortcodes, PHP template tags, or the GigPress widget on your WordPress-powered website.http://gigpress.com/

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Stout Google CalendarThe Stout Google Calendar plugin allows you to easily add and customize embedded Google Calendars to your WordPress site. You can even change color settings that are not normally modifiable, allowing you to seamlessly integrate Google Calendars into the look of your site. No more ugly Google Calendars!http://wordpress.org/extend/plugins/stout-google-calendar/

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Google Calendar EventsParses Google Calendar feeds and displays the events as a calendar grid or list on a page, post or widget.http://wordpress.org/extend/plugins/google-calendar-events/

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Booking CalendarThis WordPress plugin will enable online booking services for your site. Visitors to your site will be able to check availability of apartments, houses, hotel rooms, or services you offer. They can also make reservations and appointments with the ability to choose from multi-day, single day, or by the hour booking. Your clients can even view and register for upcoming events. With integrated Paypal support your clients can pay online!http://wordpress.org/extend/plugins/booking/

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WordTourUseful for when you go out on tour - you can add venues, shows, tracks, etc.
WordTour is a comprehensive WordPress plug-in for performing artists and their agents. WordTour offers you a no-fuss time-saving solution to events management and a whole lot more! Utilize WordPress to instantaneously update an event in your social media networks status, autocomplete all boring and nagging details, let WordTour automatically generate web pages for all your events, artists and tour, allow to RSVP, comment and associate photo galleries and videos for each event, easily access and control your database information and more.
http://wordpress.org/extend/plugins/wordtour/