The simply the best collection of event management scripts
A jQuery plugin that provides a full-sized, drag & drop calendar. Fetches events on-the-fly for each month and is easily configured to use your own feed format. An extension is also provided for Google Calendar. It is customizable and exposes hooks for user-triggered events (like clicking or dragging an event).
A full view template based calendar for Twitter Bootstrap.
CalendR is an object oriented Calendar management library on top of PHP5.3+ Date objects. Use it to deal with all your needs for calendars and events.