BusySync lets you sync up multiple iCals to keep everybody up to date on upcoming events. From the BusySync interface, you'll be able to select the calendars you want to share and the rights you want to give to other users (read, read or read & write). You can monitor when calendars have been synced and, if you've been disconnected for some time, BusySync can automatically sync calendars as soon as you reconnect to your network.