Plugin that makes a post 'bookable', using the custom fields.
This plugin allows you to create a bookable event using the custom fields. A post creator can make a post 'bookable' selecting the custom field 'bookable_event' (automatically created at the plugin activation) and setting a value for it, e.g. the 'yes' value. The registered users can add/remove their participation to an event (represented by a post) by links at the bottom of the post. This plugin provides also a widget displaying the list of the last 'bookable events' added.